ci: build multi-arch db image

.github/workflows/dev-db-nightly.yml

@@ -33,19 +33,32 @@ jobs:
       contents: read
       packages: write
     steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
           
       - name: Get Current Date as Tag
         id: date
         run: echo "::set-output name=date::$(date +'%Y%m%d')"
-          
-      - name: Docker Build & Push Action
-        uses: mr-smithers-excellent/docker-build-push@v5.6
+        
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
         with:
-          image: ${{ env.IMAGE_NAME }}
-          tags: nightly-${{ steps.date.outputs.date }}, latest
-          registry: ${{ env.REGISTRY }}
-          dockerfile: docker/db.Dockerfile
+          registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker Build & Push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          file: docker/db.Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ghcr.io/ietf-tools/datatracker-db:nightly-${{ steps.date.outputs.date }}
+            ghcr.io/ietf-tools/datatracker-db:latest