Try a matrix

.github/workflows/tests.yaml

@@ -6,13 +6,31 @@ on:
 
 jobs:
   build:
+    strategy:
+      matrix:
+        image: [ "ubuntu:latest", "ubuntu:22.04", "archlinux:latest" ]
+    continue-on-error: true
     runs-on: ubuntu-latest
+    container:
+      image: ${{ matrix.image }}
     steps:
-    - name: Check out repository code
+    - name: Checkout prepare script
       uses: actions/checkout@v4
+      with:
+        sparse-checkout: prepare.sh
+        sparse-checkout-cone-mode: false
 
     - name: Prepare build environment
-      run: ./prepare.sh -us | tee -a "$GITHUB_ENV"
+      run: ./prepare.sh -u | tee -a "$GITHUB_ENV"
+
+    - name: Check out repository code
+      uses: actions/checkout@v4
+
+    - run: chown $(id -u):$(id -g) .
+    - run: ls -la .
+    - run: ls -la ..
+    - run: git show
+    - run: git ls-files
 
     - name: Build
       run: make build

prepare.sh

@@ -18,20 +18,33 @@ done
 shift $((OPTIND-1))
 
 if [ -z "$DISTRO" ]; then
-    DISTRO=$(lsb_release -is)
+    if command -v lsb_release; then
+        DISTRO=$(lsb_release -is)
+    elif command -v pacman >/dev/null; then
+        DISTRO="Arch"
+    elif command -v apt-get >/dev/null; then
+        # TODO: debian
+        DISTRO="Ubuntu"
+    else
+        echo "unable to figure out distribution: $DISTRO" 1>&2
+        exit 1
+    fi
 fi
 echo "distro: $DISTRO" 1>&2
 
-if [ "$DISTRO" = "Arch" ]; then
+if [ "$DISTRO" = "Arch" ] || command -v pacman >/dev/null; then
     if [ -n "$UPDATE" ]; then
-        $SUDO pacman -Sy
+        $SUDO pacman -Sy 1>&2
     fi
-    $SUDO pacman -S lua libxrandr
-elif [ "$DISTRO" = "Ubuntu" ]; then
+    $SUDO pacman -S --noconfirm 1>&2 \
+        git make \
+        lua libxrandr
+elif [ "$DISTRO" = "Ubuntu" ] || command -v apt-get >/dev/null; then
     if [ -n "$UPDATE" ]; then
         $SUDO apt-get update 1>&2
     fi
     $SUDO apt-get install --yes --no-install-recommends 1>&2 \
+        git ca-certificates \
         make \
         liblua5.4-dev libxrandr-dev
     echo "LUA_PKG=lua54"