Simplify ARM64 Docker image cross-compilation

Author: valeriansaliou

.github/workflows/build.yml

@@ -76,22 +76,16 @@ jobs:
 
   build-docker:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        platform:
-          - linux/arm64
-          - linux/amd64
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
-        if: ${{ matrix.platform != 'linux/amd64' }}
+      - name: Set up QEMU for cross-compilation
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       - name: Acquire Docker image metadata
         id: metadata
@@ -100,63 +94,17 @@ jobs:
           images: valeriansaliou/sonic
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Build and push by digest
+      - name: Build and push Docker image
         uses: docker/build-push-action@v4
         id: build
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.metadata.outputs.tags }}
           labels: ${{ steps.metadata.outputs.labels }}
-          platforms: ${{ matrix.platform }}
-          outputs: type=image,name=valeriansaliou/sonic,push-by-digest=true,name-canonical=true,push=true
-
-      - name: Export digests
-        run: |
-          mkdir -p /tmp/digests
-          digest="${{ steps.build.outputs.digest }}"
-          touch "/tmp/digests/${digest#sha256:}"
-
-      - name: Upload digests
-        uses: actions/upload-artifact@v3
-        with:
-          name: docker-digests
-          path: /tmp/digests/*
-          if-no-files-found: error
-          retention-days: 1
-
-  merge-docker:
-    runs-on: ubuntu-latest
-    needs:
-      - build-docker
-
-    steps:
-      - name: Download digests
-        uses: actions/download-artifact@v3
-        with:
-          name: docker-digests
-          path: /tmp/digests
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
-      - name: Login to Docker Hub
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Extract metadata (tags, labels) for Docker
-        id: meta
-        uses: docker/metadata-action@v4
-        with:
-          images: valeriansaliou/sonic
-
-      - name: Create manifest list and push
-        working-directory: /tmp/digests
-        run: |
-          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
-            $(printf 'valeriansaliou/sonic@sha256:%s ' *)
+          push: true