Add ARM build in GitHub Actions

- Hint: Tried to use the plattform parameter of the build-push-action,
   however this failed with an error in the Jobs.
   Therefore, I used a matrix with the platforms.
 - The ARM build takes a long time.

.github/workflows/test-latest-container-images.yaml

@@ -12,12 +12,20 @@ jobs:
           - apache
           - fpm-alpine
           - fpm
+        platform:
+          - linux/amd64
+          - linux/arm64
     steps:
       - name: 'Check out the repo'
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
+
+      - name: 'Set up QEMU'
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: 'arm64,arm'
 
       - name: 'Set up Docker Buildx'
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
 
       - name: 'Build Container images'
         uses: docker/build-push-action@v2
@@ -26,6 +34,7 @@ jobs:
           push: false
           load: true
           tags: docker.io/martialblog/limesurvey:6-${{ matrix.context }}
+          platforms: ${{ matrix.platform }}
 
       - name: 'Run Structure tests'
         uses: plexsystems/container-structure-test-action@v0.2.0