🐛 Try to fix env variable pull failure (#1368)

Author: KATO-Hiro

.github/workflows/ci.yml

@@ -96,7 +96,7 @@ jobs:
           DATABASE_URL: ${{ secrets.PREVIEW_DATABASE_URL }}
 
       - name: Pull Vercel Environment Information
-        run: vercel pull --yes --environment=preview --token=${{ secrets.VERCEL_TOKEN }}
+        run: pnpm vercel pull --yes --environment=preview --token=${{ secrets.VERCEL_TOKEN }}
 
       - name: Build Project Artifacts
         run: vercel build --token=${{ secrets.VERCEL_TOKEN }}