⚙️ Fix build workflow

.github/workflows/check-app.yml

@@ -46,5 +46,15 @@ jobs:
   build-app:
     runs-on: ubuntu-latest
     steps:
-      - name: Build
+      - uses: actions/checkout@v3
+
+      - name: Setup pnpm 8
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build app
         run: pnpm onlybuild