Try to merge images

Author: javitonino

.github/workflows/release.yml

@@ -89,13 +89,15 @@ jobs:
 
   push-docker:
     name: Build public docker image
-    runs-on: ${{ matrix.runner }}
+    runs-on: ${{ matrix.arch.runner }}
     strategy:
       fail-fast: false
       matrix:
-        runner:
-          - ubuntu-24.04
-          - ubuntu-24.04-arm
+        arch:
+          - runner: ubuntu-24.04
+            tag: amd64
+          - runner: ubuntu-24.04-arm
+            tag: arm64
         image:
           - name: nucliadb
             dockerfile: Dockerfile.withbinding
@@ -129,18 +131,76 @@ jobs:
           echo "version_number=$VERSION" >> $GITHUB_OUTPUT
           echo "hash=$HASH" >> $GITHUB_OUTPUT
 
-      - name: Build and push
+      - id: build
+        name: Build and push
         uses: docker/build-push-action@v4
         with:
           context: .
           file: ${{ matrix.image.dockerfile }}
           push: true
-          tags: |
-            nuclia/${{ matrix.image.name }}:latest
-            nuclia/${{ matrix.image.name }}:${{ steps.version_step.outputs.version_number }}
-            nuclia/${{ matrix.image.name }}:${{ steps.version_step.outputs.hash }}
+          tags: nuclia/${{ matrix.image.name }}
           cache-from: type=gha
           cache-to: type=gha,mode=min
+          outputs: type=image,push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: echo "${{ steps.build.outputs.digest }}" > /tmp/digest-${{ matrix.image.name }}-${{ matrix.arch.tag }}
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.image.name }}-${{ matrix.arch.tag }}
+          path: /tmp/digest-${{ matrix.image.name }}-${{ matrix.arch.tag }}
+          if-no-files-found: error
+          retention-days: 1
+
+  merge-docker:
+    runs-on: ubuntu-latest
+    needs:
+      - push-docker
+    strategy:
+      matrix:
+        image:
+          - nucliadb
+          - nidx
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Get release version
+        id: version_step
+        run: |-
+          python bump.py --build=${{github.run_number}}
+          cargo update --manifest-path nidx/Cargo.toml nidx_binding
+          VERSION=`cat VERSION`
+          HASH=`git rev-parse --short HEAD`
+          echo "version_number=$VERSION" >> $GITHUB_OUTPUT
+          echo "hash=$HASH" >> $GITHUB_OUTPUT
+
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-${{ matrix.image }}-*
+          merge-multiple: true
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Create manifest list and push
+        working-directory: /tmp/digests
+        run: >
+          docker buildx imagetools create
+          --tag nuclia/${{ matrix.image }}:latest
+          --tag nuclia/${{ matrix.image }}:${{ steps.version_step.outputs.version_number }}
+          --tag nuclia/${{ matrix.image }}:${{ steps.version_step.outputs.hash }}
+          $(printf 'nuclia/${{ matrix.image }}@%s ' $(cat *))
 
   deploy:
     name: Deploy Helm chart and trigger internal CI