ci-cd: containers building multiarch matrix

.github/workflows/docker-images-build-and-push.yaml

@@ -8,13 +8,11 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
+  IMAGE_NAME: parktrack-project/api-server-rs
   IS_DEFAULT: ${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
 
 jobs:
   build-and-push:
-    runs-on: ubuntu-latest
-
     permissions:
       contents: read
       packages: write
@@ -26,6 +24,15 @@ jobs:
             dockerfile: ./Dockerfile
           - name: migrate
             dockerfile: ./Dockerfile.migrate
+        platform:
+          - name: linux/amd64
+            runner: ubuntu-24.04
+            digest_file_suffix: linux-amd64
+          - name: linux/arm64
+            runner: ubuntu-24.04-arm
+            digest_file_suffix: linux-arm64
+
+    runs-on: ${{ matrix.platform.runner }}
 
     steps:
       - name: Checkout
@@ -56,19 +63,97 @@ jobs:
         uses: docker/metadata-action@v6
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-${{ matrix.image.name }}
-          tags: |
-            type=raw,value=development,enable=${{ github.ref != format('refs/heads/{0}', github.event.repository.default_branch) }}
-            type=raw,value=latest,enable={{is_default_branch}}
-            type=ref,event=branch
-            type=sha,format=short
 
       - name: Build and push
+        id: build
         uses: docker/build-push-action@v7
         with:
           context: .
           file: ${{ matrix.image.dockerfile }}
-          tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha,scope=${{ matrix.image.name }}
-          cache-to: type=gha,scope=${{ matrix.image.name }},mode=max
-          push: ${{ github.event_name == 'push' }}
+          cache-from: type=gha,scope=${{ matrix.image.name }}-${{ matrix.platform.name }}
+          cache-to: type=gha,scope=${{ matrix.image.name }}-${{ matrix.platform.name }},mode=max
+          push: ${{ github.event_name == 'push' }}
+          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-${{ matrix.image.name }},push-by-digest=true,name-canonical=true,push=${{ github.event_name == 'push' }}
+          platforms: ${{ matrix.platform.name }}
+
+      - name: Export digest
+        run: |
+          mkdir -p ${{ runner.temp }}/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
+
+      - name: Upload digest artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.image.name }}-${{ matrix.platform.digest_file_suffix }}
+          path: ${{ runner.temp }}/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+
+  merge-manifests:
+    name: Merge manifests
+
+    permissions:
+      contents: read
+      packages: write
+
+    runs-on: ubuntu-latest
+
+    if: github.event_name == 'push'
+
+    needs: build-and-push
+
+    strategy:
+      matrix:
+        image:
+          - name: app
+          - name: migrate
+
+    steps:
+      - name: Download all digests
+        uses: actions/download-artifact@v4
+        with:
+          pattern: digests-${{ matrix.image.name }}-*
+          merge-multiple: true
+          path: ${{ runner.temp }}/digests
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v6
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-${{ matrix.image.name }}
+          tags: |
+            type=raw,value=development,enable=${{ github.ref != format('refs/heads/{0}', github.event.repository.default_branch) }}
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=branch
+            type=sha,format=short
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Log in to GHCR
+        if: env.REGISTRY == 'ghcr.io' && github.event_name == 'push'
+        uses: docker/login-action@v4
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Optional generic registry login for non-GHCR
+      - name: Log in to external registry
+        if: env.REGISTRY != 'ghcr.io' && github.event_name == 'push'
+        uses: docker/login-action@v4
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Merge manifests
+        working-directory: ${{ runner.temp }}/digests
+        run: |
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-${{ matrix.image.name }}@sha256:%s ' *)
+