Build the arm64 image using native arm64 runners (#13)

Author: doganulus

.github/workflows/labs344-build.yml

@@ -8,41 +8,111 @@ on:
       - .github/workflows/labs344-build.yml # Self-trigger
 
 env:
-  REGISTRY: ghcr.io/bouncmpe
-  IMAGE_NAME: labs344
-  IMAGE_TAG: 2024-2025-1
+  REGISTRY: ghcr.io
+  IMAGE_NAME: bouncmpe/labs344
+  IMAGE_TAG: 2025-2026-1
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ubuntu-24.04, ubuntu-24.04-arm]
+    runs-on: ${{ matrix.platform }}
     permissions:
       id-token: write
       contents: read
       attestations: write
       packages: write
 
     steps:
+      - name: Get platform pair
+        run: |
+          platform_info=$(docker info --format '{{.OSType}}/{{.Architecture}}')
+          platform_pair=$(echo "$platform_info" | sed 's/\//-/g')
+          echo "PLATFORM_PAIR=${platform_pair}" >> $GITHUB_ENV
+          
       - name: Checkout repository
         uses: actions/checkout@v4
-
-      - name: Setup QEMU setup
-        uses: docker/setup-qemu-action@v3
-
+        
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+            
+      - name: Login to the registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+          
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+        
+      - name: Build and push Docker image
+        id: build
+        uses: docker/build-push-action@v6
+        with:
+          context: containers/labs344
+          outputs: type=image,"name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}",push-by-digest=true,name-canonical=true,push=true
+          provenance: false
+          sbom: false
+
+      - name: Export digest
+        run: |
+          mkdir -p ${{ runner.temp }}/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
 
-      - name: Log in to the registry
+      - 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
+
+  merge:
+    runs-on: ubuntu-latest
+    needs:
+      - build
+    steps:
+      - name: Download digests
+        uses: actions/download-artifact@v4
+        with:
+          path: ${{ runner.temp }}/digests
+          pattern: digests-*
+          merge-multiple: true
+          
+      - name: Login to the registry
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
+          username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
         with:
-          context: containers/labs344
-          provenance: mode=max
-          platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest,${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}
+          images: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=${{ env.IMAGE_TAG }}
+            type=raw,value=latest,enable={{ is_default_branch }}
+            
+      - 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") \
+            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}