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:
The current rpm repository places all packages in the same repository,
and different systems (el7,f34) may hit packages that do not belong to
this distribution ( #25304 ) , which now supports grouping of rpm.
Fixes#25304 .
Fixes#27056 .
Refactor: [#25866](https://github.com/go-gitea/gitea/pull/25866)
Fixes#24723
Direct serving of content aka HTTP redirect is not mentioned in any of
the package registry specs but lots of official registries do that so it
should be supported by the usual clients.
