ci: add setup-buildx-action to fix cache-backend error

.github/workflows/docker-publish.yml

@@ -34,6 +34,11 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      # Set up Docker Buildx
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action
       - name: Log into registry ${{ env.REGISTRY }}