Speed up release workflow with native arm64 runners

.github/workflows/release.yml

@@ -11,30 +11,78 @@ env:
   SPEEDTEST_IMAGE_NAME: ozark-connect/speedtest
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
+  build:
+    strategy:
+      fail-fast: true
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+    runs-on: ${{ matrix.runner }}
+    permissions:
+      contents: read
+      packages: write
 
     steps:
       - uses: actions/checkout@v4
 
-      - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+      - name: Set platform pair
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
         with:
-          dotnet-version: '10.0.x'
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Restore dependencies
-        run: dotnet restore
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
-      - name: Build
-        run: dotnet build --no-restore --configuration Release
+      - name: Extract version from tag
+        id: version
+        run: echo "version=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
 
-      - name: Test
-        env:
-          FLUENT_ASSERTIONS_LICENSED: ${{ secrets.FLUENT_ASSERTIONS_LICENSED }}
-        run: dotnet test --no-build --configuration Release --verbosity normal
+      - name: Build and push by digest
+        id: build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./docker/Dockerfile
+          platforms: ${{ matrix.platform }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=${{ steps.version.outputs.version }}
+          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
+          cache-from: type=gha,scope=build-${{ env.PLATFORM_PAIR }}
+          cache-to: type=gha,scope=build-${{ env.PLATFORM_PAIR }},mode=max
 
-  build-and-push:
-    needs: test
+      - 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:
+    needs: build
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -43,6 +91,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
 
@@ -67,24 +122,17 @@ jobs:
             type=semver,pattern={{major}}
             type=raw,value=latest,enable={{is_default_branch}}
 
-      - name: Extract version from tag
-        id: version
-        run: echo "version=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
+      - 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.REGISTRY }}/${{ env.IMAGE_NAME }}@sha256:%s ' *)
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          file: ./docker/Dockerfile
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          build-args: |
-            VERSION=${{ steps.version.outputs.version }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}
 
+      # Speedtest image - trivial build (copy files into nginx:alpine), QEMU is fine
       - name: Extract metadata for speedtest image
         id: speedtest-meta
         uses: docker/metadata-action@v5
@@ -109,7 +157,7 @@ jobs:
           cache-to: type=gha,mode=max
 
   publish-release:
-    needs: build-and-push
+    needs: merge
     runs-on: ubuntu-latest
     permissions:
       contents: write