Properly publish multi arch image from multipler runners

.github/workflows/ci.yml

@@ -542,12 +542,6 @@ jobs:
         uses: docker/metadata-action@v5
         with:
           images: ghcr.io/${{ github.repository }}
-          tags: |
-            type=raw,value=latest,enable={{is_default_branch}}
-            type=ref,event=branch
-            type=ref,event=tag
-            type=ref,event=pr
-            type=sha
 
       - name: Docker Login
         uses: docker/login-action@v3
@@ -557,14 +551,75 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
+        id: build
         uses: docker/build-push-action@v6
         with:
           context: .
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
           platforms: ${{ matrix.arch.docker_platform }}
-          provenance: false # https://github.com/docker/build-push-action/issues/755
+          outputs: type=image,"name=ghcr.io/${{ github.repository }}",push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p ${{ runner.temp }}/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
+
+      - name: Adjust digest
+        run: |
+          platform=${{ matrix.arch.docker_platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: docker-digests-${{ env.PLATFORM_PAIR }}
+          path: ${{ runner.temp }}/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  publish-docker-images-digest:
+    name: Publish Docker image digest
+    runs-on: ubuntu-24.04
+    needs:
+      - publish-docker-images
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: ${{ runner.temp }}/digests
+          pattern: docker-digests-*
+          merge-multiple: true
+
+      - name: Docker Login
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker Metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=sha
+
+      - name: Create manifest list and push
+        working-directory: ${{ runner.temp }}/digests
+        run: |
+          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") $(printf 'ghcr.io/${{ github.repository }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ghcr.io/${{ github.repository }}:${{ steps.meta.outputs.version }}
 
   release-archive:
     name: Release archive