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.
This PR adds an Alpine package registry. You can follow [this tutorial](https://wiki.alpinelinux.org/wiki/Creating_an_Alpine_package) to build a *.apk package for testing. This functionality is similar to the Debian registry (#22854) and therefore shares some methods. I marked this PR as blocked because it should be merged after #22854. ![grafik](https://user-images.githubusercontent.com/1666336/227779595-b76163aa-eea1-4a79-9583-775c24ad74e8.png) --------- Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: Giteabot <teabot@gitea.io>