WIP

Author: darashi

.github/workflows/build-container-image.yml

@@ -4,14 +4,31 @@ on:
   push:
     branches:
       - main
+      - multi-arch # WIP
 
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}
+  REGISTRY_IMAGE: ghcr.io/${{ github.repository }}
 
 jobs:
-  build-and-push-image:
-    runs-on: ubuntu-latest
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        platform:
+          - linux/amd64
+          - linux/arm64
+        include:
+          - platform: linux/amd64
+            os: ubuntu-latest
+            platform_pair: linux-amd64
+          - platform: linux/arm64
+            os: ubuntu-24.04-arm
+            platform_pair: linux-arm64
+
+    runs-on: ${{ matrix.os }}
+
     permissions:
       contents: read
       packages: write
@@ -27,35 +44,95 @@ jobs:
         uses: actions/cache@v4
         with:
           path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          key: ${{ matrix.platform_pair }}-buildx-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-buildx-
+            ${{ matrix.platform_pair }}-buildx-
 
       - name: Log in to the Container registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@v3
+        uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.REGISTRY_IMAGE }}
           tags: |
             type=ref,event=branch
             type=ref,event=tag
             type=ref,event=pr
             type=sha,prefix=snapshot-
-          flavor: latest=${{ github.ref == 'refs/heads/main' }}
+          # flavor: latest=${{ github.ref == 'refs/heads/main' }}
 
-      - name: Build
+      - name: Build and push by digest
+        id: build
         uses: docker/build-push-action@v6
         with:
           context: .
-          push: true
+          platforms: ${{ matrix.platform }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=local,src=/tmp/.buildx-cache
           cache-to: type=local,dest=/tmp/.buildx-cache
+          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
+
+      - name: Export digest
+        run: |
+          mkdir -p ${{ runner.temp }}/digests
+          digest="${{ steps.build.outputs.digest }}"
+          touch "${{ runner.temp }}/digests/${digest#sha256:}"
+
+      - name: Upload digest
+        uses: actions/upload-artifact@v4
+        with:
+          name: digests-${{ matrix.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: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY_IMAGE }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=sha,prefix=snapshot-
+          flavor: latest=${{ github.ref == 'refs/heads/main' }}
+
+      - 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_IMAGE }}@sha256:%s ' *)
+
+      - name: Inspect image
+        run: |
+          docker buildx imagetools inspect ${{ env.REGISTRY_IMAGE }}:${{ steps.meta.outputs.version }}