ci: 启用Docker Buildx设置步骤

取消注释Docker Buildx设置步骤，为后续Docker构建流程做准备

.github/workflows/docker-build.yml

@@ -15,8 +15,8 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      # - name: Set up Docker Buildx
-      #   uses: docker/setup-buildx-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
 
       # - name: Log in to Docker Hub
       #   uses: docker/login-action@v3