Update the workflow and the version

.github/workflows/main.yml

@@ -5,21 +5,61 @@ on:
     branches:
       - 'master'
 
+env:
+  VERSION: '15-3.4'
+  DOCKER_IMAGE: 'ghcr.io/jobrad-gmbh/postgis:15-3.4-alpine'
+
 jobs:
   build-docker:
-    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        include:
+          - runner: ubuntu-20.04
+            platform: linux/amd64
+            suffix: amd64
+          - runner: Linux-ARM64-2C-8GB
+            platform: linux/arm64
+            suffix: arm64
+    runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v3
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+
+      - name: Login to registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push Docker images
         uses: docker/build-push-action@v5
         with:
           context: .
-          file: 13-3.4/alpine/Dockerfile
-          platforms: linux/amd64,linux/arm64
+          file: ${{ env.VERSION }}/alpine/Dockerfile
+          platforms: ${{ matrix.platform }}
           push: true
           tags: |
-            ghcr.io/jobrad-gmbh/postgis:13-3.4-alpine
+            ${{ env.DOCKER_IMAGE }}-${{ matrix.suffix }}
+          provenance: false
+
+  combine-docker:
+    runs-on: ubuntu-latest
+    needs: build-docker
+    steps:
+      - name: Login to registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: int128/docker-manifest-create-action@v2
+        with:
+          tags: ${{ env.DOCKER_IMAGE }}
+          sources: |
+            ${{ env.DOCKER_IMAGE }}-amd64
+            ${{ env.DOCKER_IMAGE }}-arm64
+          push: true