Add github action to build a behat container

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

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+name: build-push-test-docker-image
+
+on:
+  push:
+    branches: 
+      - feature/behat_tests
+  workflow_dispatch:
+
+jobs:
+  build-push-test-docker-image:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - 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: Set docker labels and tags
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/openconext/OpenConext-devconf/OpenConext-devconf
+          flavor: |
+            latest=false
+            suffix=-test
+          tags: |
+            type=ref,event=tag
+            type=semver,pattern={{version}}
+            type=sha
+            type=raw,suffix=,value=test
+
+      - name: Build and push the TEST image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: stepup/tests/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

stepup/tests/Dockerfile

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+FROM ghcr.io/openconext/openconext-basecontainers/php72-apache2-node16-composer2:latest
+RUN apt-get update && \ 
+  apt-get install -y docker.io mariadb-client 
+WORKDIR /config/tests/behat