chore: switch to native arm builder

Author: moshloop

.github/workflows/release.yaml

@@ -47,16 +47,22 @@ jobs:
           file_glob: true
   docker:
     needs: semantic-release
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+    runs-on: ${{ matrix.runner }}
     steps:
-      - name: Free disk space
-        run: |
-          sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
-          sudo docker image prune --all --force
       - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
+      - name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -67,17 +73,64 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
-      - name: Build and push multi-arch Docker image
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: ${{ matrix.platform }}
+          outputs: type=image,push-by-digest=true,name-canonical=true,push=true
+          tags: flanksource/batch-runner
+
+      - name: Export digest
         run: |
-          docker buildx build \
-            --platform linux/amd64,linux/arm64 \
-            --tag flanksource/batch-runner:latest \
-            --tag flanksource/batch-runner:v${{ needs.semantic-release.outputs.release-version }} \
-            --push .
+          mkdir -p ${{ runner.temp }}/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
 
-  helm:
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ env.PLATFORM_PAIR }}
+          path: ${{ runner.temp }}/digests/*
+          if-no-files-found: error
+          retention-days: 1
+
+  docker-merge:
     runs-on: ubuntu-latest
     needs: [semantic-release, docker]
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: ${{ runner.temp }}/digests
+          pattern: digests-*
+          merge-multiple: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Create manifest list and push
+        working-directory: ${{ runner.temp }}/digests
+        run: |
+          docker buildx imagetools create \
+            -t flanksource/batch-runner:latest \
+            -t flanksource/batch-runner:v${{ needs.semantic-release.outputs.release-version }} \
+            $(printf 'flanksource/batch-runner@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect flanksource/batch-runner:v${{ needs.semantic-release.outputs.release-version }}
+
+  helm:
+    runs-on: ubuntu-latest
+    needs: [semantic-release, docker-merge]
     if: needs.semantic-release.outputs.new-release-published == 'true'
     steps:
       - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0