Add `yamllint` (#26965)

So that https://github.com/go-gitea/gitea/pull/26964 does not happen
again. Merge this after that PR. Config is based on
[node's](https://github.com/nodejs/node/blob/main/.yamllint.yaml).

---------

Co-authored-by: techknowlogick <techknowlogick@gitea.com>

8 files changed, 197 insertions, 175 deletions

diff --git a/.github/ISSUE_TEMPLATE/bug-report.yaml b/.github/ISSUE_TEMPLATE/bug-report.yaml
index 1004c55de3..c482affbbd 100644
--- a/.github/ISSUE_TEMPLATE/bug-report.yaml
+++ b/.github/ISSUE_TEMPLATE/bug-report.yaml
@@ -2,90 +2,90 @@ name: Bug Report
 description: Found something you weren't expecting? Report it here!
 labels: ["kind/bug"]
 body:
-- type: markdown
-  attributes:
-    value: |
-      NOTE: If your issue is a security concern, please send an email to security@gitea.io instead of opening a public issue.
-- type: markdown
-  attributes:
-    value: |
-      1. Please speak English, this is the language all maintainers can speak and write.
-      2. Please ask questions or configuration/deploy problems on our Discord
-         server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
-      3. Make sure you are using the latest release and
-         take a moment to check that your issue hasn't been reported before.
-      4. Make sure it's not mentioned in the FAQ (https://docs.gitea.com/help/faq)
-      5. It's really important to provide pertinent details and logs (https://docs.gitea.com/help/support),
-         incomplete details will be handled as an invalid report.
-- type: textarea
-  id: description
-  attributes:
-    label: Description
-    description: |
-      Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see below)
-      If you are using a proxy or a CDN (e.g. Cloudflare) in front of Gitea, please disable the proxy/CDN fully and access Gitea directly to confirm the issue still persists without those services.
-- type: input
-  id: gitea-ver
-  attributes:
-    label: Gitea Version
-    description: Gitea version (or commit reference) of your instance
-  validations:
-    required: true
-- type: dropdown
-  id: can-reproduce
-  attributes:
-    label: Can you reproduce the bug on the Gitea demo site?
-    description: |
-      If so, please provide a URL in the Description field
-      URL of Gitea demo: https://try.gitea.io
-    options:
-    - "Yes"
-    - "No"
-  validations:
-    required: true
-- type: markdown
-  attributes:
-    value: |
-      It's really important to provide pertinent logs
-      Please read https://docs.gitea.com/administration/logging-config#collecting-logs-for-help
-      In addition, if your problem relates to git commands set `RUN_MODE=dev` at the top of app.ini
-- type: input
-  id: logs
-  attributes:
-    label: Log Gist
-    description: Please provide a gist URL of your logs, with any sensitive information (e.g. API keys) removed/hidden
-- type: textarea
-  id: screenshots
-  attributes:
-    label: Screenshots
-    description: If this issue involves the Web Interface, please provide one or more screenshots
-- type: input
-  id: git-ver
-  attributes:
-    label: Git Version
-    description: The version of git running on the server
-- type: input
-  id: os-ver
-  attributes:
-    label: Operating System
-    description: The operating system you are using to run Gitea
-- type: textarea
-  id: run-info
-  attributes:
-    label: How are you running Gitea?
-    description: |
-      Please include information on whether you built Gitea yourself, used one of our downloads, are using https://try.gitea.io or are using some other package
-      Please also tell us how you are running Gitea, e.g. if it is being run from docker, a command-line, systemd etc.
-      If you are using a package or systemd tell us what distribution you are using
-  validations:
-    required: true
-- type: dropdown
-  id: database
-  attributes:
-    label: Database
-    description: What database system are you running?
-    options:
-    - PostgreSQL
-    - MySQL/MariaDB
-    - MSSQL
-    - SQLite
+  - type: markdown
+    attributes:
+      value: |
+        NOTE: If your issue is a security concern, please send an email to security@gitea.io instead of opening a public issue.
+  - type: markdown
+    attributes:
+      value: |
+        1. Please speak English, this is the language all maintainers can speak and write.
+        2. Please ask questions or configuration/deploy problems on our Discord
+           server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
+        3. Make sure you are using the latest release and
+           take a moment to check that your issue hasn't been reported before.
+        4. Make sure it's not mentioned in the FAQ (https://docs.gitea.com/help/faq)
+        5. It's really important to provide pertinent details and logs (https://docs.gitea.com/help/support),
+           incomplete details will be handled as an invalid report.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see below)
+        If you are using a proxy or a CDN (e.g. Cloudflare) in front of Gitea, please disable the proxy/CDN fully and access Gitea directly to confirm the issue still persists without those services.
+  - type: input
+    id: gitea-ver
+    attributes:
+      label: Gitea Version
+      description: Gitea version (or commit reference) of your instance
+    validations:
+      required: true
+  - type: dropdown
+    id: can-reproduce
+    attributes:
+      label: Can you reproduce the bug on the Gitea demo site?
+      description: |
+        If so, please provide a URL in the Description field
+        URL of Gitea demo: https://try.gitea.io
+      options:
+        - "Yes"
+        - "No"
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |
+        It's really important to provide pertinent logs
+        Please read https://docs.gitea.com/administration/logging-config#collecting-logs-for-help
+        In addition, if your problem relates to git commands set `RUN_MODE=dev` at the top of app.ini
+  - type: input
+    id: logs
+    attributes:
+      label: Log Gist
+      description: Please provide a gist URL of your logs, with any sensitive information (e.g. API keys) removed/hidden
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If this issue involves the Web Interface, please provide one or more screenshots
+  - type: input
+    id: git-ver
+    attributes:
+      label: Git Version
+      description: The version of git running on the server
+  - type: input
+    id: os-ver
+    attributes:
+      label: Operating System
+      description: The operating system you are using to run Gitea
+  - type: textarea
+    id: run-info
+    attributes:
+      label: How are you running Gitea?
+      description: |
+        Please include information on whether you built Gitea yourself, used one of our downloads, are using https://try.gitea.io or are using some other package
+        Please also tell us how you are running Gitea, e.g. if it is being run from docker, a command-line, systemd etc.
+        If you are using a package or systemd tell us what distribution you are using
+    validations:
+      required: true
+  - type: dropdown
+    id: database
+    attributes:
+      label: Database
+      description: What database system are you running?
+      options:
+        - PostgreSQL
+        - MySQL/MariaDB
+        - MSSQL
+        - SQLite
diff --git a/.github/ISSUE_TEMPLATE/feature-request.yaml b/.github/ISSUE_TEMPLATE/feature-request.yaml
index b481e0c2de..71aaa09423 100644
--- a/.github/ISSUE_TEMPLATE/feature-request.yaml
+++ b/.github/ISSUE_TEMPLATE/feature-request.yaml
@@ -2,23 +2,23 @@ name: Feature Request
 description: Got an idea for a feature that Gitea doesn't have currently?  Submit your idea here!
 labels: ["kind/proposal"]
 body:
-- type: markdown
-  attributes:
-    value: |
-      1. Please speak English, this is the language all maintainers can speak and write.
-      2. Please ask questions or configuration/deploy problems on our Discord
-         server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
-      3. Please take a moment to check that your feature hasn't already been suggested.
-- type: textarea
-  id: description
-  attributes:
-    label: Feature Description
-    placeholder: |
-      I think it would be great if Gitea had...
-  validations:
-    required: true
-- type: textarea
-  id: screenshots
-  attributes:
-    label: Screenshots
-    description: If you can, provide screenshots of an implementation on another site e.g. GitHub
+  - type: markdown
+    attributes:
+      value: |
+        1. Please speak English, this is the language all maintainers can speak and write.
+        2. Please ask questions or configuration/deploy problems on our Discord
+           server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
+        3. Please take a moment to check that your feature hasn't already been suggested.
+  - type: textarea
+    id: description
+    attributes:
+      label: Feature Description
+      placeholder: |
+        I think it would be great if Gitea had...
+    validations:
+      required: true
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If you can, provide screenshots of an implementation on another site e.g. GitHub
diff --git a/.github/ISSUE_TEMPLATE/ui.bug-report.yaml b/.github/ISSUE_TEMPLATE/ui.bug-report.yaml
index d5c41bb836..ef0a1014e5 100644
--- a/.github/ISSUE_TEMPLATE/ui.bug-report.yaml
+++ b/.github/ISSUE_TEMPLATE/ui.bug-report.yaml
@@ -2,65 +2,65 @@ name: Web Interface Bug Report
 description: Something doesn't look quite as it should?  Report it here!
 labels: ["kind/bug", "kind/ui"]
 body:
-- type: markdown
-  attributes:
-    value: |
-      NOTE: If your issue is a security concern, please send an email to security@gitea.io instead of opening a public issue.
-- type: markdown
-  attributes:
-    value: |
-      1. Please speak English, this is the language all maintainers can speak and write.
-      2. Please ask questions or configuration/deploy problems on our Discord
-         server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
-      3. Please take a moment to check that your issue doesn't already exist.
-      4. Make sure it's not mentioned in the FAQ (https://docs.gitea.com/help/faq)
-      5. Please give all relevant information below for bug reports, because
-         incomplete details will be handled as an invalid report.
-      6. In particular it's really important to provide pertinent logs. If you are certain that this is a javascript
-         error, show us the javascript console. If the error appears to relate to Gitea the server you must also give us
-         DEBUG level logs. (See https://docs.gitea.com/administration/logging-config#collecting-logs-for-help)
-- type: textarea
-  id: description
-  attributes:
-    label: Description
-    description: |
-      Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see below)
-      If using a proxy or a CDN (e.g. CloudFlare) in front of gitea, please disable the proxy/CDN fully and connect to gitea directly to confirm the issue still persists without those services.
-- type: textarea
-  id: screenshots
-  attributes:
-    label: Screenshots
-    description: Please provide at least 1 screenshot showing the issue.
-  validations:
-    required: true
-- type: input
-  id: gitea-ver
-  attributes:
-    label: Gitea Version
-    description: Gitea version (or commit reference) your instance is running
-  validations:
-    required: true
-- type: dropdown
-  id: can-reproduce
-  attributes:
-    label: Can you reproduce the bug on the Gitea demo site?
-    description: |
-      If so, please provide a URL in the Description field
-      URL of Gitea demo: https://try.gitea.io
-    options:
-    - "Yes"
-    - "No"
-  validations:
-    required: true
-- type: input
-  id: os-ver
-  attributes:
-    label: Operating System
-    description: The operating system you are using to access Gitea
-- type: input
-  id: browser-ver
-  attributes:
-    label: Browser Version
-    description: The browser and version that you are using to access Gitea
-  validations:
-    required: true
+  - type: markdown
+    attributes:
+      value: |
+        NOTE: If your issue is a security concern, please send an email to security@gitea.io instead of opening a public issue.
+  - type: markdown
+    attributes:
+      value: |
+        1. Please speak English, this is the language all maintainers can speak and write.
+        2. Please ask questions or configuration/deploy problems on our Discord
+           server (https://discord.gg/gitea) or forum (https://discourse.gitea.io).
+        3. Please take a moment to check that your issue doesn't already exist.
+        4. Make sure it's not mentioned in the FAQ (https://docs.gitea.com/help/faq)
+        5. Please give all relevant information below for bug reports, because
+           incomplete details will be handled as an invalid report.
+        6. In particular it's really important to provide pertinent logs. If you are certain that this is a javascript
+           error, show us the javascript console. If the error appears to relate to Gitea the server you must also give us
+           DEBUG level logs. (See https://docs.gitea.com/administration/logging-config#collecting-logs-for-help)
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Please provide a description of your issue here, with a URL if you were able to reproduce the issue (see below)
+        If using a proxy or a CDN (e.g. CloudFlare) in front of gitea, please disable the proxy/CDN fully and connect to gitea directly to confirm the issue still persists without those services.
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: Please provide at least 1 screenshot showing the issue.
+    validations:
+      required: true
+  - type: input
+    id: gitea-ver
+    attributes:
+      label: Gitea Version
+      description: Gitea version (or commit reference) your instance is running
+    validations:
+      required: true
+  - type: dropdown
+    id: can-reproduce
+    attributes:
+      label: Can you reproduce the bug on the Gitea demo site?
+      description: |
+        If so, please provide a URL in the Description field
+        URL of Gitea demo: https://try.gitea.io
+      options:
+        - "Yes"
+        - "No"
+    validations:
+      required: true
+  - type: input
+    id: os-ver
+    attributes:
+      label: Operating System
+      description: The operating system you are using to access Gitea
+  - type: input
+    id: browser-ver
+    attributes:
+      label: Browser Version
+      description: The browser and version that you are using to access Gitea
+    validations:
+      required: true
diff --git a/.github/labeler.yml b/.github/labeler.yml
index c9ee8a9e5c..4b4fc91e39 100644
--- a/.github/labeler.yml
+++ b/.github/labeler.yml
@@ -22,3 +22,4 @@ kind/lint:
   - ".markdownlint.yaml"
   - ".spectral.yaml"
   - ".stylelintrc.yaml"
+  - ".yamllint.yaml"
diff --git a/.github/stale.yml b/.github/stale.yml
index 6a9f341cbf..ebe95acf53 100644
--- a/.github/stale.yml
+++ b/.github/stale.yml
@@ -9,8 +9,8 @@ daysUntilClose: 14
 
 # Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
 exemptLabels:
-  - status/blocked 
-  - kind/security 
+  - status/blocked
+  - kind/security
   - lgtm/done
   - reviewed/confirmed
   - priority/critical
@@ -27,7 +27,7 @@ staleLabel: stale
 
 # Comment to post when marking as stale. Set to `false` to disable
 markComment: >
-  This issue has been automatically marked as stale because it has not had recent activity. 
+  This issue has been automatically marked as stale because it has not had recent activity.
   I am here to help clear issues left open even if solved or waiting for more insight.
   This issue will be closed if no further activity occurs during the next 2 weeks.
   If the issue is still valid just add a comment to keep it alive.
diff --git a/.github/workflows/files-changed.yml b/.github/workflows/files-changed.yml
index 24de4076f2..48db7a732e 100644
--- a/.github/workflows/files-changed.yml
+++ b/.github/workflows/files-changed.yml
@@ -17,6 +17,8 @@ on:
         value: ${{ jobs.detect.outputs.docker }}
       swagger:
         value: ${{ jobs.detect.outputs.swagger }}
+      yaml:
+        value: ${{ jobs.detect.outputs.yaml }}
 
 jobs:
   detect:
@@ -30,6 +32,7 @@ jobs:
       templates: ${{ steps.changes.outputs.templates }}
       docker: ${{ steps.changes.outputs.docker }}
       swagger: ${{ steps.changes.outputs.swagger }}
+      yaml: ${{ steps.changes.outputs.yaml }}
     steps:
       - uses: actions/checkout@v3
       - uses: dorny/paths-filter@v2
@@ -82,3 +85,8 @@ jobs:
               - "package.json"
               - "package-lock.json"
               - ".spectral.yaml"
+
+            yaml:
+              - "**/*.yml"
+              - "**/*.yaml"
+              - ".yamllint.yaml"
diff --git a/.github/workflows/pull-compliance.yml b/.github/workflows/pull-compliance.yml
index 45dd77fd92..bcbd218846 100644
--- a/.github/workflows/pull-compliance.yml
+++ b/.github/workflows/pull-compliance.yml
@@ -39,6 +39,19 @@ jobs:
       - run: make deps-py
       - run: make lint-templates
 
+  lint-yaml:
+    if: needs.files-changed.outputs.yaml == 'true'
+    needs: files-changed
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - run: pip install poetry
+      - run: make deps-py
+      - run: make lint-yaml
+
   lint-swagger:
     if: needs.files-changed.outputs.swagger == 'true'
     needs: files-changed
diff --git a/.github/workflows/pull-db-tests.yml b/.github/workflows/pull-db-tests.yml
index 50c92a9e9b..bbe589d5c8 100644
--- a/.github/workflows/pull-db-tests.yml
+++ b/.github/workflows/pull-db-tests.yml
@@ -88,7 +88,7 @@ jobs:
       mysql:
         image: mysql:5.7
         env:
-          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_ALLOW_EMPTY_PASSWORD: true
           MYSQL_DATABASE: test
         ports:
           - "3306:3306"
@@ -160,7 +160,7 @@ jobs:
       mysql:
         image: mysql:5.7
         env:
-          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_ALLOW_EMPTY_PASSWORD: true
           MYSQL_DATABASE: test
         ports:
           - "3306:3306"
@@ -205,7 +205,7 @@ jobs:
       mysql8:
         image: mysql:8
         env:
-          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_ALLOW_EMPTY_PASSWORD: true
           MYSQL_DATABASE: testgitea
         ports:
           - "3306:3306"