fix: merging images of different architecture

.github/workflows/docker-publish.yml

@@ -52,6 +52,10 @@ jobs:
       actions: read
       security-events: write
     steps:
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
       - name: Lowercase Image name
         run: |
           echo "IMAGE=${IMAGE_NAME@L}" >>${GITHUB_ENV}
@@ -165,9 +169,98 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta-hub.outputs.tags }}
           labels: ${{ steps.meta-hub.outputs.labels }}
+          outputs: type=image,name=${{ env.IMAGE_DOCKER_HUB }},push-by-digest=true,name-canonical=true,push=true
           cache-from: type=gha
           cache-to: type=gha,mode=max
           build-args: |
             BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
             VCS_REF=$(git rev-parse --short HEAD)
             VERSION=${{ steps.version.outputs.version }}
+      - name: Export digest
+        run: |
+          mkdir -p /tmp/digests
+          digest="${{ steps.build-and-push-hub.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:
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+      actions: read
+      security-events: write
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      - name: Set version
+        id: version
+        run: echo "version=$(cat VERSION)" >> $GITHUB_OUTPUT
+      - 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-hub
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_DOCKER_HUB }}
+          tags: |
+            type=semver,pattern={{version}},value=${{ steps.version.outputs.version }}
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_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.IMAGE_DOCKER_HUB }}@sha256:%s ' *)
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.IMAGE_DOCKER_HUB }}:${{ steps.meta-hub.outputs.version }}
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set repo
+        id: repo
+        run: |
+          if [[ $GITHUB_REF == "refs/heads/master" || $GITHUB_REF == refs/tags/* ]]; then 
+            echo "repo=${DOCKER_REPO@L}" >> $GITHUB_OUTPUT
+          else 
+            echo "repo=${DOCKER_REPO_DEV@L}" >> $GITHUB_OUTPUT
+          fi
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ steps.repo.outputs.repo }}
+          tags: |
+            type=semver,pattern={{version}},value=${{ steps.version.outputs.version }}
+      - 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") \
+            $(printf '${{ steps.repo.outputs.repo }}@sha256:%s ' *)
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ steps.repo.outputs.repo }}:${{ steps.meta-hub.outputs.version }}