feat: use native ARM64 runners with matrix strategy for faster builds

.github/workflows/release.yml

@@ -10,12 +10,19 @@ env:
   IMAGE_NAME: ${{ github.repository }}
 
 jobs:
-  build-and-push:
-    runs-on: ubuntu-latest
+  build-platform:
+    runs-on: ${{ matrix.runner }}
     permissions:
       contents: read
       packages: write
       id-token: write
+    strategy:
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm64
 
     steps:
       - name: Checkout repository
@@ -45,18 +52,20 @@ jobs:
             org.opencontainers.image.title=Barycenter
             org.opencontainers.image.description=OpenID Connect Identity Provider with federation and auto-registration
             org.opencontainers.image.vendor=${{ github.repository_owner }}
+          flavor: |
+            suffix=-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
 
-      - name: Build and push Docker image
+      - name: Build and push platform-specific image
         id: build
         uses: docker/build-push-action@v6
         with:
           context: .
-          platforms: linux/amd64,linux/arm64
+          platforms: ${{ matrix.platform }}
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          cache-from: type=gha,scope=${{ matrix.platform }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.platform }}
           build-args: |
             VERSION=${{ github.ref_name }}
             REVISION=${{ github.sha }}
@@ -68,9 +77,48 @@ jobs:
           subject-digest: ${{ steps.build.outputs.digest }}
           push-to-registry: true
 
+  create-manifest:
+    runs-on: ubuntu-latest
+    needs: build-platform
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for manifest
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}},enable=${{ !contains(github.ref_name, 'alpha') && !contains(github.ref_name, 'beta') && !contains(github.ref_name, 'rc') }}
+            type=semver,pattern={{major}},enable=${{ !contains(github.ref_name, 'alpha') && !contains(github.ref_name, 'beta') && !contains(github.ref_name, 'rc') }}
+            type=sha,prefix=sha-
+
+      - name: Create and push multi-platform manifest
+        run: |
+          # Extract tags into an array
+          TAGS=$(echo '${{ steps.meta.outputs.tags }}' | tr '\n' ' ')
+
+          # For each tag, create a manifest combining both platform images
+          for TAG in $TAGS; do
+            echo "Creating manifest for $TAG"
+            docker buildx imagetools create -t $TAG \
+              ${TAG}-amd64 \
+              ${TAG}-arm64
+          done
+
   create-github-release:
     runs-on: ubuntu-latest
-    needs: build-and-push
+    needs: create-manifest
     permissions:
       contents: write