Fix some RPM registry flaws (#28782)

Related #26984
(https://github.com/go-gitea/gitea/pull/26984#issuecomment-1889588912)

Fix admin cleanup message.
Fix models `Get` not respecting default values.
Rebuild RPM repository files after cleanup.
Do not add RPM group to package version name.
Force stable sorting of Alpine/Debian/RPM repository data.
Fix missing deferred `Close`.
Add tests for multiple RPM groups.
Removed non-cached `ReplaceAllStringRegex`.

If there are multiple groups available, it's stated in the package
installation screen:

![grafik](https://github.com/go-gitea/gitea/assets/1666336/8f132760-882c-4ab8-9678-77e47dfc4415)

1 files changed, 35 insertions, 14 deletions

diff --git a/docs/content/usage/packages/rpm.en-us.md b/docs/content/usage/packages/rpm.en-us.md
index 586e48d47f..1f93376b7b 100644
--- a/docs/content/usage/packages/rpm.en-us.md
+++ b/docs/content/usage/packages/rpm.en-us.md
@@ -24,16 +24,26 @@ The following examples use `dnf`.
 
 ## Configuring the package registry
 
-To register the RPM registry add the url to the list of known apt sources:
+To register the RPM registry add the url to the list of known sources:
 
 ```shell
 dnf config-manager --add-repo https://gitea.example.com/api/packages/{owner}/rpm/{group}.repo
 ```
 
-| Placeholder | Description                                        |
-| ----------- |----------------------------------------------------|
-| `owner`     | The owner of the package.                          |
-| `group`     |  Everything, e.g. `el7`, `rocky/el9` , `test/fc38`.|
+| Placeholder | Description |
+| ----------- | ----------- |
+| `owner`     | The owner of the package. |
+| `group`     | Optional: Everything, e.g. empty, `el7`, `rocky/el9`, `test/fc38`. |
+
+Example:
+
+```shell
+# without a group
+dnf config-manager --add-repo https://gitea.example.com/api/packages/testuser/rpm.repo
+
+# with the group 'centos/el7'
+dnf config-manager --add-repo https://gitea.example.com/api/packages/testuser/rpm/centos/el7.repo
+```
 
 If the registry is private, provide credentials in the url. You can use a password or a [personal access token](development/api-usage.md#authentication):
 
@@ -41,7 +51,7 @@ If the registry is private, provide credentials in the url. You can use a passwo
 dnf config-manager --add-repo https://{username}:{your_password_or_token}@gitea.example.com/api/packages/{owner}/rpm/{group}.repo
 ```
 
-You have to add the credentials to the urls in the `rpm.repo` file in `/etc/yum.repos.d` too.
+You have to add the credentials to the urls in the created `.repo` file in `/etc/yum.repos.d` too.
 
 ## Publish a package
 
@@ -54,11 +64,17 @@ PUT https://gitea.example.com/api/packages/{owner}/rpm/{group}/upload
 | Parameter | Description |
 | --------- | ----------- |
 | `owner`   | The owner of the package. |
-| `group`   |  Everything, e.g. `el7`, `rocky/el9` , `test/fc38`.|
+| `group`   | Optional: Everything, e.g. empty, `el7`, `rocky/el9`, `test/fc38`. |
 
 Example request using HTTP Basic authentication:
 
 ```shell
+# without a group
+curl --user your_username:your_password_or_token \
+     --upload-file path/to/file.rpm \
+     https://gitea.example.com/api/packages/testuser/rpm/upload
+
+# with the group 'centos/el7'
 curl --user your_username:your_password_or_token \
      --upload-file path/to/file.rpm \
      https://gitea.example.com/api/packages/testuser/rpm/centos/el7/upload
@@ -83,17 +99,22 @@ To delete an RPM package perform a HTTP DELETE operation. This will delete the p
 DELETE https://gitea.example.com/api/packages/{owner}/rpm/{group}/package/{package_name}/{package_version}/{architecture}
 ```
 
-| Parameter         | Description                |
-|-------------------|----------------------------|
-| `owner`           | The owner of the package.  |
-| `group`           | The package group       .  |
-| `package_name`    | The package name.          |
-| `package_version` | The package version.       |
-| `architecture`    | The package architecture.  |
+| Parameter         | Description |
+| ----------------- | ----------- |
+| `owner`           | The owner of the package. |
+| `group`           | Optional: The package group. |
+| `package_name`    | The package name. |
+| `package_version` | The package version. |
+| `architecture`    | The package architecture. |
 
 Example request using HTTP Basic authentication:
 
 ```shell
+# without a group
+curl --user your_username:your_token_or_password -X DELETE \
+     https://gitea.example.com/api/packages/testuser/rpm/package/test-package/1.0.0/x86_64
+
+# with the group 'centos/el7'
 curl --user your_username:your_token_or_password -X DELETE \
      https://gitea.example.com/api/packages/testuser/rpm/centos/el7/package/test-package/1.0.0/x86_64
 ```