Migrate to actions-docker

.forgejo/workflows/build-and-test.yml

@@ -8,15 +8,8 @@ jobs:
  build:
   runs-on: docker
   container:
-   image: archlinux:base-devel
+   image: git.staropensource.de/staropensource/actions-docker:latest
   steps:
-   - name: Setup system
-     run: |
-      set -x
-      pacman-key --init
-      pacman-key --populate
-      sed 's/\#ParallelDownloads = 5/ParallelDownloads = 15/g' -i /etc/pacman.conf
-      pacman -Syu --noconfirm nodejs git
    - name: Install latest OpenJDK release
      run: pacman -S --noconfirm jdk-openjdk
    - name: Checkout