Use pnpm for github action

Author: srithon

.github/workflows/deploy.yml

@@ -30,17 +30,24 @@ jobs:
         working-directory: ./kmonadx-wasm
         run: wasm-pack build --target web
 
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+          # don't run install yet because we want to use the cache
+          run_install: false
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'npm'
+          cache: 'pnpm'
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm ci
 
       - name: Build website
-        run: npm run build
+        run: pnpm run build
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3