fix multibuild

.github/workflows/ci.yaml

@@ -5,6 +5,9 @@ on:
     branches:
       - 'main'
 
+env:
+  GHCR_REPO: ghcr.io/mystdeim/github-runner
+
 jobs:
   build:
     name: Build
@@ -21,28 +24,103 @@ jobs:
           - platform: linux/arm64
             runner_platform: linux-arm64
     steps:
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.GHCR_REPO }}
+
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Login to GitHub Container Registry
+      - name: Login to GHCR
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
         with:
           context: ./src
           file: ./src/Dockerfile
-          push: true
-          tags: |
-            ghcr.io/mystdeim/github-runner:${{ github.run_number }}
-            ghcr.io/mystdeim/github-runner:latest
           platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          tags: |
+            ${{ env.GHCR_REPO }}:${{ github.run_number }}
+            ${{ env.GHCR_REPO }}:latest
+          outputs: type=image,"name=${{ env.GHCR_REPO }}",push-by-digest=true,name-canonical=true,push=true
           build-args: |
             RUNNER_PLATFORM=${{ matrix.runner_platform }}
+
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "/tmp/digests/${digest#sha256:}"          
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: /tmp/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+merge:
+  runs-on: ubuntu-latest
+  needs:
+    - build
+  steps:
+    - name: Download digests
+      uses: actions/download-artifact@v4
+      with:
+        path: /tmp/digests
+        pattern: digests-*
+        merge-multiple: true
+
+    - name: Login to GHCR
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: |
+          ${{ env.GHCR_REPO }}
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}            
+
+    - 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.GHCR_REPO }}@sha256:%s ' *)          
+
+    - name: Inspect image
+      run: |
+        docker buildx imagetools inspect ${{ env.GHCR_REPO }}:${{ steps.meta.outputs.version }}