Update the workflow and the version

Author: borna-ng

.github/workflows/main.yml

@@ -5,9 +5,22 @@ 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
 
@@ -18,8 +31,20 @@ jobs:
         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
+    steps:
+      - uses: int128/docker-manifest-create-action@v2
+        with:
+          tags: ${{ env.DOCKER_IMAGE }}
+          sources: |
+            ${{ env.DOCKER_IMAGE }}-amd64
+            ${{ env.DOCKER_IMAGE }}-arm64
+          push: true