feat(workflow) add Node.js and PostCSS setup tasks

.gitea/workflows/pipeline-test.yaml

@@ -20,6 +20,16 @@ jobs:
         with:
           go-version: '1.20.5'
 
+      - name: Set up Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '20'
+
+      - name: Install PostCSS
+        run: |
+          npm install -g postcss postcss-cli
+          npm install autoprefixer
+
       - name: Set up Hugo Extended
         uses: peaceiris/actions-hugo@v2
         with: