ci: add GitHub Actions workflow for building and pushing DevContainer images

Author: y-developer

.github/workflows/build-and-push.yaml

@@ -0,0 +1,102 @@
+name: Build and Push DevContainer Images
+
+on:
+  workflow_dispatch:
+
+jobs:
+  detect-changes:
+    name: Detect Changed Images
+    runs-on: ubuntu-24.04
+    outputs:
+      node: ${{ steps.changes.outputs.node }}
+      php+node: ${{ steps.changes.outputs.php+node }}
+      python: ${{ steps.changes.outputs.python }}
+      ubuntu: ${{ steps.changes.outputs.ubuntu }}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Detect changes
+        id: changes
+        uses: dorny/paths-filter@v3
+        with:
+          filters: |
+            'node':
+              - 'dockerfiles/node/Dockerfile'
+            'php+node':
+              - 'dockerfiles/php+node/Dockerfile'
+            'python':
+              - 'dockerfiles/python/Dockerfile'
+            'ubuntu':
+              - 'dockerfiles/ubuntu/Dockerfile'
+
+  build-and-push:
+    name: Build ${{ matrix.image }}
+    needs: detect-changes
+    if: |
+      needs.detect-changes.outputs.node == 'true' ||
+      needs.detect-changes.outputs.php+node == 'true' ||
+      needs.detect-changes.outputs.python == 'true' ||
+      needs.detect-changes.outputs.ubuntu == 'true'
+    runs-on: ubuntu-24.04
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - image: node
+            changed: ${{ needs.detect-changes.outputs.node }}
+          - image: php+node
+            changed: ${{ needs.detect-changes.outputs.php+node }}
+          - image: python
+            changed: ${{ needs.detect-changes.outputs.python }}
+          - image: ubuntu
+            changed: ${{ needs.detect-changes.outputs.ubuntu }}
+    steps:
+      - name: Skip if not changed
+        if: matrix.changed != 'true'
+        run: |
+          echo "Skipping ${{ matrix.image }} - no changes detected"
+          exit 0
+
+      - name: Checkout Repository
+        if: matrix.changed == 'true'
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        if: matrix.changed == 'true'
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        if: matrix.changed == 'true'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        if: matrix.changed == 'true'
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_PREFIX }}/devcontainer-${{ matrix.image }}
+          tags: |
+            type=raw,value=latest
+            type=sha,prefix={{branch}}-
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+
+      - name: Build and push
+        if: matrix.changed == 'true'
+        uses: docker/build-push-action@v5
+        with:
+          context: ./dockerfiles/${{ matrix.image }}
+          file: ./dockerfiles/${{ matrix.image }}/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          platforms: linux/amd64,linux/arm64