fix frontend build

.github/workflows/ci.yml

@@ -73,27 +73,19 @@ jobs:
   build-frontend:
     name: Build Yale Access Frontend
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ./packages/frontend
-
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v2
+      - name: Setup PNPM and Node
+        uses: pnpm/setup@v3
         with:
-          node-version: 20.x
-
-      - name: Setup Yarn
-        run: npm install -g yarn
-
-      - name: Install dependencies
-        run: yarn install
+          working-directory: packages/frontend
+          runtime: node@22
 
       - name: Build
-        run: yarn run build
+        working-directory: ./packages/frontend
+        run: pnpm run build
 
   publish-frontend:
     name: Push Yale Access Frontend Docker Image