github/workflows/ubuntu: Unified workflow, use buildah & podman

- Use a unified workflow for both PR & Push jobs
- Build using buildah & push with podman

Signed-off-by: Timothée Ravier <[email protected]>

.github/workflows/ubuntu-images.yaml

@@ -1,6 +1,14 @@
-name: "Images: Build and push Ubuntu toolbx images"
+name: "Ubuntu: Build and push ubuntu-toolbox images"
+
+permissions: read-all
 
 on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - images/ubuntu/**
+      - .github/workflows/ubuntu-images.yaml
   push:
     branches:
       - main
@@ -10,52 +18,79 @@ on:
   schedule:
     - cron: '0 0 * * MON'
 
-# Prevent multiple workflow runs from racing
-concurrency: ${{ github.workflow }}
-
 env:
-  latest_release: '22.04'
+  distro: 'ubuntu'
+  latest_release: '23.10'
+  platforms: 'linux/amd64, linux/arm64'
+  registry: 'quay.io/toolbx'
+  username: 'toolbx+github'
+
+# Prevent multiple workflow runs from racing to ensure that pushes are made
+# sequentialy for the main branch. Also cancel in progress workflow runs for
+# pull requests only.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
-  build-and-push-images:
+  build-push-images:
     strategy:
       matrix:
         release: ['16.04', '18.04', '20.04', '22.04', '23.04', '23.10']
 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+      - name: Set up QEMU for multi-arch builds
+        shell: bash
+        run: |
+          sudo apt update
+          sudo apt install qemu-user-static
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+      - name: Build container image
+        uses: redhat-actions/buildah-build@v2
+        if: env.latest_release != matrix.release
+        with:
+          platforms: ${{ env.platforms }}
+          context: images/${{ env.distro }}/${{ matrix.release }}
+          image: ${{ env.distro }}-toolbox
+          tags: ${{ matrix.release }}
+          containerfiles: images/${{ env.distro }}/${{ matrix.release }}/Containerfile
+          layers: false
+          oci: true
 
-      - name: Login to Quay.io
-        uses: docker/login-action@v2
+      - name: Build container image (latest tag)
+        uses: redhat-actions/buildah-build@v2
+        if: env.latest_release == matrix.release
         with:
-          registry: quay.io
-          username: 'toolbx+github'
-          password: ${{ secrets.QUAY_ROBOT_TOKEN }}
+          platforms: ${{ env.platforms }}
+          context: images/${{ env.distro }}/${{ matrix.release }}
+          image: ${{ env.distro }}-toolbox
+          tags: ${{ matrix.release }} latest
+          containerfiles: images/${{ env.distro }}/${{ matrix.release }}/Containerfile
+          layers: false
+          oci: true
 
-      - name: Build and push Ubuntu ${{ matrix.release }} toolbox image
-        uses: docker/build-push-action@v3
+      - name: Push to Container Registry
+        uses: redhat-actions/push-to-registry@v2
+        id: push
+        if: (github.event_name == 'push' || github.event_name == 'schedule') && github.ref == 'refs/heads/main' && env.latest_release != matrix.release
         with:
-          context: images/ubuntu/${{ matrix.release }}
-          file: images/ubuntu/${{ matrix.release }}/Containerfile
-          platforms: linux/amd64,linux/arm64,linux/ppc64le
-          push: true
-          no-cache: true
-          tags: quay.io/toolbx/ubuntu-toolbox:${{ matrix.release }}
-
-      - name: Push latest tag
-        if: env.latest_release == matrix.release
-        uses: docker/build-push-action@v3
+          username: ${{ env.username }}
+          password: ${{ secrets.QUAY_ROBOT_TOKEN }}
+          image: ${{ env.distro }}-toolbox
+          registry: ${{ env.registry }}
+          tags: ${{ matrix.release }}
+
+      - name: Push to Container Registry (latest tag)
+        uses: redhat-actions/push-to-registry@v2
+        id: push-latest
+        if: (github.event_name == 'push' || github.event_name == 'schedule') && github.ref == 'refs/heads/main' && env.latest_release == matrix.release
         with:
-          context: images/ubuntu/${{ matrix.release }}
-          file: images/ubuntu/${{ matrix.release }}/Containerfile
-          platforms: linux/amd64,linux/arm64,linux/ppc64le
-          push: true
-          tags: quay.io/toolbx/ubuntu-toolbox:latest
+          username: ${{ env.username }}
+          password: ${{ secrets.QUAY_ROBOT_TOKEN }}
+          image: ${{ env.distro }}-toolbox
+          registry: ${{ env.registry }}
+          tags: ${{ matrix.release }} latest