[action]Modify releases site workflow file

.github/workflows/releases-site.yml

@@ -37,6 +37,8 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 20.x
+      - name: Install clean-css-cli
+        run: npm install clean-css-cli -g
       - name: Install dependencies and build
         run: |
           cd site