📄 Update GitHub Actions workflow to use pnpm for dependency management and build process

Author: rtugeek

.github/workflows/github-page.yml

@@ -22,11 +22,15 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '18.x'
+      - name: Setup pnpm
+        uses: actions/setup-pnpm@v4
+        with:
+          version: 8
       - name: Build static files
         id: build
         run: |
-          npm install
-          npm run build
+          pnpm install
+          pnpm run build
       - name: Upload static files as artifact
         id: deployment
         uses: actions/upload-pages-artifact@v3