github: fix engine error

Author: Deflaimun

.github/workflows/build-prod.yml

@@ -28,6 +28,7 @@ jobs:
     if: ${{ success() }}
     steps:
       - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
       - name: Deploy to Cloudflare Pages
         uses: cloudflare/wrangler-action@v3
         with: