ci: update node action, add pnpm action, use pnpm to install and build

Author: dually8

.github/workflows/gh-pages.yml

@@ -35,16 +35,25 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v5
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+          run_install: false
+
       - name: Setup Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: "20.x"
+          cache: 'pnpm'
 
       - name: Build sveltekit project
         shell: bash
         env:
           BASE_PATH: '/${{ github.event.repository.name }}'
-        run: npm ci && npm run build
+        run: |
+          pnpm install
+          pnpm run build
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3