GHA: Add action to build and publish a test container

.github/workflows/build-push-test-docker-image.yml

@@ -0,0 +1,45 @@
+name: build-push-test-docker-image
+
+on:
+  push:
+    branches: 
+      - feature/build-and-publish-test-container
+  workflow_dispatch:
+
+jobs:
+  build-push-test-docker-image:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build the app
+        uses: openconext/build-and-publish-test-container/php72-node14@main
+        with:
+          dir_to_include: 'tests/'
+          use_yarn: false
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push the TEST image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: docker/Dockerfile.test
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ghcr.io/openconext/stepup-middleware/stepup-middleware:test