add pnpm

Author: artcz

.github/workflows/preview.yml

@@ -17,6 +17,12 @@ jobs:
       - name: Set timestamp for build/deploy
         run: echo "TIMESTAMP=$(date +%Y%m%d%H%M%S)" >> $GITHUB_ENV
 
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          run_install: false
+
+
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with: