chore : ci 수정(pnpm install)

Author: y00eunji

.github/workflows/deploy.yml

@@ -9,8 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - run: pnpm install
-      - run: pnpm run build
+      - run: npm install -g pnpm && pnpm install
+      - run: pnpm build
       - uses: actions/configure-pages@v5
       - uses: actions/upload-pages-artifact@v3
         with: