Update deploy.yml

Setup pnpm

Author: Jinho1011

.github/workflows/deploy.yml

@@ -20,6 +20,11 @@ jobs:
         with:
           node-version: "16"
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
       - name: Install dependencies
         run: pnpm install