Add Arch package registry (#32692)

Close #25037
Close #31037

This PR adds a Arch package registry usable with pacman.

![grafik](https://github.com/user-attachments/assets/81cdb0c2-02f9-4733-bee2-e48af6b45224)

Rewrite of #25396 and #31037. You can follow [this
tutorial](https://wiki.archlinux.org/title/Creating_packages) to build a
package for testing.

Docs PR: https://gitea.com/gitea/docs/pulls/111

Co-authored-by: [d1nch8g@ion.lc](mailto:d1nch8g@ion.lc)
Co-authored-by: @ExplodingDragon

---------

Co-authored-by: dancheg97 <dancheg97@fmnx.su>
Co-authored-by: dragon <ExplodingFKL@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

options/locale/locale_en-US.ini

@@ -3524,6 +3524,11 @@ alpine.repository = Repository Info
 alpine.repository.branches = Branches
 alpine.repository.repositories = Repositories
 alpine.repository.architectures = Architectures
+arch.registry = Add server with related repository and architecture to <code>/etc/pacman.conf</code>:
+arch.install = Sync package with pacman:
+arch.repository = Repository Info
+arch.repository.repositories = Repositories
+arch.repository.architectures = Architectures
 cargo.registry = Setup this registry in the Cargo configuration file (for example <code>~/.cargo/config.toml</code>):
 cargo.install = To install the package using Cargo, run the following command:
 chef.registry = Setup this registry in your <code>~/.chef/config.rb</code> file: