use custom docker image

.gitea/workflows/build.yml

@@ -9,24 +9,12 @@ jobs:
     build:
         runs-on: ubuntu-latest
         container:
-          image: archlinux
+          image: git.azur.webhop.me/azur/arch-builder:latest
           options: --privileged
           permissions:
               packages: write
               contents: write
         steps:
-          - name: Cache Pacman Data
-            uses: actions/cache@v4
-            with:
-              path: |
-                /var/cache/pacman/pkg
-                /var/lib/pacman/sync
-              key: pacman-cache-${{ github.run_id }}
-              restore-keys: |
-                pacman-cache-
-          - name: Update packages
-            run: |
-                pacman -Syu --noconfirm --noprogressbar --needed base-devel devtools btrfs-progs dbus sudo nodejs pacman-contrib
           - name: Checkout repo
             uses: actions/checkout@v4
             with:
@@ -62,8 +50,6 @@ jobs:
             if: steps.compare.outputs.build == 'true'
             run: |
               cd $GITHUB_WORKSPACE
-              useradd -m builder
-              echo "builder ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers
               chown -R builder:builder .
               sudo -u builder updpkgsums
               sudo -u builder makepkg -s --noconfirm