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>

services/packages/packages.go

@@ -355,6 +355,8 @@ func CheckSizeQuotaExceeded(ctx context.Context, doer, owner *user_model.User, p
 	switch packageType {
 	case packages_model.TypeAlpine:
 		typeSpecificSize = setting.Packages.LimitSizeAlpine
+	case packages_model.TypeArch:
+		typeSpecificSize = setting.Packages.LimitSizeArch
 	case packages_model.TypeCargo:
 		typeSpecificSize = setting.Packages.LimitSizeCargo
 	case packages_model.TypeChef: