fix: switch CI to Artix container, drop custom calamares build

- Change CI container from archlinux:latest to artixlinux/artixlinux:base-openrc
  so calamares and yad are available from Artix world repo directly
- Remove calamares from packages.yaml — no need to build it, Artix provides it
- Revert calamares PKGBUILD: put services-openrc back in skip list (unused)
- Packages now built by CI: wallpapers, yay, downgrade, keyring, mirrorlist,
  desktop-settings, branding, memes, welcome, hal, grub-theme, live

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     container:
-      image: archlinux:latest
+      image: artixlinux/artixlinux:base-openrc
 
     steps:
     - uses: actions/checkout@v4

packages.yaml

@@ -1,5 +1,4 @@
 packages:
-  - calamares
   - antergos-wallpapers
   - yay
   - downgrade

packages/calamares/PKGBUILD

@@ -41,6 +41,7 @@ build() {
     initramfscfg
     interactiveterminal
     packagechooser
+    services-openrc
   )
 
   local _pkgsrc_dir="$srcdir/$_pkgname-$pkgver"