ci: publish arm64 image

.github/workflows/docker.yml

@@ -1,31 +1,65 @@
 name: Docker Image CI
 on:
-  workflow_dispatch:
-  workflow_run:
-    workflows: [Test]
+  push:
     branches: [main]
-    types:
-      - completed
+
+concurrency:
+  group: docker-publish-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   build:
-    name: Build
-    runs-on: ubuntu-latest
+    name: Build ${{ matrix.platform }}
+    permissions:
+      contents: read
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux/amd64
+            runner: ubuntu-latest
+            suffix: amd64
+          - platform: linux/arm64
+            runner: ubuntu-24.04-arm
+            suffix: arm64
+    runs-on: ${{ matrix.runner }}
     steps:
       - uses: actions/checkout@v4
-      - uses: docker/setup-qemu-action@v3
       - uses: docker/setup-buildx-action@v3
 
-      - uses: docker/login-action@v2
+      - uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build the Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
-          platforms: linux/amd64
+          platforms: ${{ matrix.platform }}
           push: true
-          tags: ghcr.io/polinetworkorg/web:latest
+          tags: ghcr.io/polinetworkorg/web:build-${{ github.sha }}-${{ matrix.suffix }}
+
+  manifest:
+    name: Publish multi-arch manifest
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Publish latest manifest
+        run: |
+          docker buildx imagetools create \
+            --tag ghcr.io/polinetworkorg/web:latest \
+            ghcr.io/polinetworkorg/web:build-${{ github.sha }}-amd64 \
+            ghcr.io/polinetworkorg/web:build-${{ github.sha }}-arm64
+          docker buildx imagetools inspect ghcr.io/polinetworkorg/web:latest