ci: 🔧 update multi-platform build to run on different runners

Author: AkashRajpurohit

.github/workflows/release.yml

@@ -12,6 +12,13 @@ permissions:
   id-token: write
   discussions: write
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  REGISTRY_IMAGE: ghcr.io/akashrajpurohit/git-sync
+
 jobs:
   test:
     name: Test
@@ -55,33 +62,34 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-  docker_build_and_push:
-    name: Docker Build & Push
+  docker_build:
+    name: Docker Build
     runs-on: ubuntu-latest
-    needs: [test]
-
+    needs: 
+      - test
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
+          - linux/arm/v7
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
-
-      - name: Set env
+      - name: Prepare
         run: |
-          echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-          echo "NOW=$(date --utc +%Y-%m-%dT%H:%M:%SZ)" >> $GITHUB_ENV
-
-      - name: Cache Docker layers
-        uses: actions/cache@v3
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV          
+      
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
         with:
-          path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-buildx-
-
+          images: ${{ env.REGISTRY_IMAGE }}
+      
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
-
+      
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -91,24 +99,68 @@ jobs:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Build & push Docker image to ghcr.io
-        uses: docker/build-push-action@v4
+      
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+      
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"          
+      
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
         with:
-          context: .
-          push: true
-          tags: |
-            - ghcr.io/${{ github.repository }}:${{ env.RELEASE_VERSION }}
-            - ghcr.io/${{ github.repository }}:latest
-          platforms: |
-            - linux/amd64
-            - linux/arm64
-            - linux/arm/v7
-          build-args: |
-            VERSION=${{ env.RELEASE_VERSION }}
-            BUILD_DATE=${{ env.NOW }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
 
-      - name: Move new cache to old cache
-        run: mv /tmp/.buildx-cache-new /tmp/.buildx-cache
+  docker_merge:
+    name: Docker Merge and Push
+    runs-on: ubuntu-latest
+    needs:
+      - test
+      - docker_build
+    timeout-minutes: 15
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+      
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      
+      - 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") \
+            $(printf '${{ env.REGISTRY_IMAGE }}@sha256:%s ' *)          
+      
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}