Implement actions (#21937)

Close #13539.

Co-authored by: @lunny @appleboy @fuxiaohei and others.

Related projects:
- https://gitea.com/gitea/actions-proto-def
- https://gitea.com/gitea/actions-proto-go
- https://gitea.com/gitea/act
- https://gitea.com/gitea/act_runner

### Summary

The target of this PR is to bring a basic implementation of "Actions",
an internal CI/CD system of Gitea. That means even though it has been
merged, the state of the feature is **EXPERIMENTAL**, and please note
that:

- It is disabled by default;
- It shouldn't be used in a production environment currently;
- It shouldn't be used in a public Gitea instance currently;
- Breaking changes may be made before it's stable.

**Please comment on #13539 if you have any different product design
ideas**, all decisions reached there will be adopted here. But in this
PR, we don't talk about **naming, feature-creep or alternatives**.

### ⚠️ Breaking

`gitea-actions` will become a reserved user name. If a user with the
name already exists in the database, it is recommended to rename it.

### Some important reviews

- What is `DEFAULT_ACTIONS_URL` in `app.ini` for?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1055954954
- Why the api for runners is not under the normal `/api/v1` prefix?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1061173592
- Why DBFS?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1061301178
- Why ignore events triggered by `gitea-actions` bot?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1063254103
- Why there's no permission control for actions?
  - https://github.com/go-gitea/gitea/pull/21937#discussion_r1090229868

### What it looks like

<details>

#### Manage runners

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205870657-c72f590e-2e08-4cd4-be7f-2e0abb299bbf.png">

#### List runs

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205872794-50fde990-2b45-48c1-a178-908e4ec5b627.png">


#### View logs

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205872501-9b7b9000-9542-4991-8f55-18ccdada77c3.png">



</details>

### How to try it

<details>

#### 1. Start Gitea

Clone this branch and [install from
source](https://docs.gitea.io/en-us/install-from-source).

Add additional configurations in `app.ini` to enable Actions:

```ini
[actions]
ENABLED = true
```

Start it.

If all is well, you'll see the management page of runners:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205877365-8e30a780-9b10-4154-b3e8-ee6c3cb35a59.png">


#### 2. Start runner

Clone the [act_runner](https://gitea.com/gitea/act_runner), and follow
the
[README](https://gitea.com/gitea/act_runner/src/branch/main/README.md)
to start it.

If all is well, you'll see a new runner has been added:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205878000-216f5937-e696-470d-b66c-8473987d91c3.png">

#### 3. Enable actions for a repo

Create a new repo or open an existing one, check the `Actions` checkbox
in settings and submit.

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205879705-53e09208-73c0-4b3e-a123-2dcf9aba4b9c.png">
<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205879383-23f3d08f-1a85-41dd-a8b3-54e2ee6453e8.png">

If all is well, you'll see a new tab "Actions":

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205881648-a8072d8c-5803-4d76-b8a8-9b2fb49516c1.png">

#### 4. Upload workflow files

Upload some workflow files to `.gitea/workflows/xxx.yaml`, you can
follow the [quickstart](https://docs.github.com/en/actions/quickstart)
of GitHub Actions. Yes, Gitea Actions is compatible with GitHub Actions
in most cases, you can use the same demo:

```yaml
name: GitHub Actions Demo
run-name: ${{ github.actor }} is testing out GitHub Actions 🚀
on: [push]
jobs:
  Explore-GitHub-Actions:
    runs-on: ubuntu-latest
    steps:
      - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
      - run: echo "🐧 This job is now running on a ${{ runner.os }} server hosted by GitHub!"
      - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
      - name: Check out repository code
        uses: actions/checkout@v3
      - run: echo "💡 The ${{ github.repository }} repository has been cloned to the runner."
      - run: echo "🖥️ The workflow is now ready to test your code on the runner."
      - name: List files in the repository
        run: |
          ls ${{ github.workspace }}
      - run: echo "🍏 This job's status is ${{ job.status }}."
```

If all is well, you'll see a new run in `Actions` tab:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205884473-79a874bc-171b-4aaf-acd5-0241a45c3b53.png">

#### 5. Check the logs of jobs

Click a run and you'll see the logs:

<img width="1792" alt="image"
src="https://user-images.githubusercontent.com/9418365/205884800-994b0374-67f7-48ff-be9a-4c53f3141547.png">

#### 6. Go on

You can try more examples in [the
documents](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions)
of GitHub Actions, then you might find a lot of bugs.

Come on, PRs are welcome.

</details>

See also: [Feature Preview: Gitea
Actions](https://blog.gitea.io/2022/12/feature-preview-gitea-actions/)

---------

Co-authored-by: a1012112796 <1012112796@qq.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

1 files changed, 176 insertions, 0 deletions

diff --git a/models/migrations/v1_19/v240.go b/models/migrations/v1_19/v240.go
new file mode 100644
index 0000000000..4505f86299
--- /dev/null
+++ b/models/migrations/v1_19/v240.go
@@ -0,0 +1,176 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_19 //nolint
+
+import (
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+func AddActionsTables(x *xorm.Engine) error {
+	type ActionRunner struct {
+		ID          int64
+		UUID        string `xorm:"CHAR(36) UNIQUE"`
+		Name        string `xorm:"VARCHAR(255)"`
+		OwnerID     int64  `xorm:"index"` // org level runner, 0 means system
+		RepoID      int64  `xorm:"index"` // repo level runner, if orgid also is zero, then it's a global
+		Description string `xorm:"TEXT"`
+		Base        int    // 0 native 1 docker 2 virtual machine
+		RepoRange   string // glob match which repositories could use this runner
+
+		Token     string `xorm:"-"`
+		TokenHash string `xorm:"UNIQUE"` // sha256 of token
+		TokenSalt string
+		// TokenLastEight string `xorm:"token_last_eight"` // it's unnecessary because we don't find runners by token
+
+		LastOnline timeutil.TimeStamp `xorm:"index"`
+		LastActive timeutil.TimeStamp `xorm:"index"`
+
+		// Store OS and Artch.
+		AgentLabels []string
+		// Store custom labes use defined.
+		CustomLabels []string
+
+		Created timeutil.TimeStamp `xorm:"created"`
+		Updated timeutil.TimeStamp `xorm:"updated"`
+		Deleted timeutil.TimeStamp `xorm:"deleted"`
+	}
+
+	type ActionRunnerToken struct {
+		ID       int64
+		Token    string `xorm:"UNIQUE"`
+		OwnerID  int64  `xorm:"index"` // org level runner, 0 means system
+		RepoID   int64  `xorm:"index"` // repo level runner, if orgid also is zero, then it's a global
+		IsActive bool
+
+		Created timeutil.TimeStamp `xorm:"created"`
+		Updated timeutil.TimeStamp `xorm:"updated"`
+		Deleted timeutil.TimeStamp `xorm:"deleted"`
+	}
+
+	type ActionRun struct {
+		ID                int64
+		Title             string
+		RepoID            int64  `xorm:"index unique(repo_index)"`
+		OwnerID           int64  `xorm:"index"`
+		WorkflowID        string `xorm:"index"`                    // the name of workflow file
+		Index             int64  `xorm:"index unique(repo_index)"` // a unique number for each run of a repository
+		TriggerUserID     int64
+		Ref               string
+		CommitSHA         string
+		Event             string
+		IsForkPullRequest bool
+		EventPayload      string `xorm:"LONGTEXT"`
+		Status            int    `xorm:"index"`
+		Started           timeutil.TimeStamp
+		Stopped           timeutil.TimeStamp
+		Created           timeutil.TimeStamp `xorm:"created"`
+		Updated           timeutil.TimeStamp `xorm:"updated"`
+	}
+
+	type ActionRunJob struct {
+		ID                int64
+		RunID             int64  `xorm:"index"`
+		RepoID            int64  `xorm:"index"`
+		OwnerID           int64  `xorm:"index"`
+		CommitSHA         string `xorm:"index"`
+		IsForkPullRequest bool
+		Name              string `xorm:"VARCHAR(255)"`
+		Attempt           int64
+		WorkflowPayload   []byte
+		JobID             string   `xorm:"VARCHAR(255)"` // job id in workflow, not job's id
+		Needs             []string `xorm:"JSON TEXT"`
+		RunsOn            []string `xorm:"JSON TEXT"`
+		TaskID            int64    // the latest task of the job
+		Status            int      `xorm:"index"`
+		Started           timeutil.TimeStamp
+		Stopped           timeutil.TimeStamp
+		Created           timeutil.TimeStamp `xorm:"created"`
+		Updated           timeutil.TimeStamp `xorm:"updated index"`
+	}
+
+	type Repository struct {
+		NumActionRuns       int `xorm:"NOT NULL DEFAULT 0"`
+		NumClosedActionRuns int `xorm:"NOT NULL DEFAULT 0"`
+	}
+
+	type ActionRunIndex db.ResourceIndex
+
+	type ActionTask struct {
+		ID       int64
+		JobID    int64
+		Attempt  int64
+		RunnerID int64              `xorm:"index"`
+		Status   int                `xorm:"index"`
+		Started  timeutil.TimeStamp `xorm:"index"`
+		Stopped  timeutil.TimeStamp
+
+		RepoID            int64  `xorm:"index"`
+		OwnerID           int64  `xorm:"index"`
+		CommitSHA         string `xorm:"index"`
+		IsForkPullRequest bool
+
+		TokenHash      string `xorm:"UNIQUE"` // sha256 of token
+		TokenSalt      string
+		TokenLastEight string `xorm:"index token_last_eight"`
+
+		LogFilename  string  // file name of log
+		LogInStorage bool    // read log from database or from storage
+		LogLength    int64   // lines count
+		LogSize      int64   // blob size
+		LogIndexes   []int64 `xorm:"LONGBLOB"` // line number to offset
+		LogExpired   bool    // files that are too old will be deleted
+
+		Created timeutil.TimeStamp `xorm:"created"`
+		Updated timeutil.TimeStamp `xorm:"updated index"`
+	}
+
+	type ActionTaskStep struct {
+		ID        int64
+		Name      string `xorm:"VARCHAR(255)"`
+		TaskID    int64  `xorm:"index unique(task_index)"`
+		Index     int64  `xorm:"index unique(task_index)"`
+		RepoID    int64  `xorm:"index"`
+		Status    int    `xorm:"index"`
+		LogIndex  int64
+		LogLength int64
+		Started   timeutil.TimeStamp
+		Stopped   timeutil.TimeStamp
+		Created   timeutil.TimeStamp `xorm:"created"`
+		Updated   timeutil.TimeStamp `xorm:"updated"`
+	}
+
+	type dbfsMeta struct {
+		ID              int64  `xorm:"pk autoincr"`
+		FullPath        string `xorm:"VARCHAR(500) UNIQUE NOT NULL"`
+		BlockSize       int64  `xorm:"BIGINT NOT NULL"`
+		FileSize        int64  `xorm:"BIGINT NOT NULL"`
+		CreateTimestamp int64  `xorm:"BIGINT NOT NULL"`
+		ModifyTimestamp int64  `xorm:"BIGINT NOT NULL"`
+	}
+
+	type dbfsData struct {
+		ID         int64  `xorm:"pk autoincr"`
+		Revision   int64  `xorm:"BIGINT NOT NULL"`
+		MetaID     int64  `xorm:"BIGINT index(meta_offset) NOT NULL"`
+		BlobOffset int64  `xorm:"BIGINT index(meta_offset) NOT NULL"`
+		BlobSize   int64  `xorm:"BIGINT NOT NULL"`
+		BlobData   []byte `xorm:"BLOB NOT NULL"`
+	}
+
+	return x.Sync(
+		new(ActionRunner),
+		new(ActionRunnerToken),
+		new(ActionRun),
+		new(ActionRunJob),
+		new(Repository),
+		new(ActionRunIndex),
+		new(ActionTask),
+		new(ActionTaskStep),
+		new(dbfsMeta),
+		new(dbfsData),
+	)
+}