👷(ci) github action job build-desk

Create the job build-desk in the workflow people.yml.
It will check that the app is linting and building correctly.

.github/workflows/people.yml

@@ -58,6 +58,25 @@ jobs:
             exit 1
           fi
 
+  build-front-desk:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: src/frontend/app/desk
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18.x'
+          cache: 'yarn'
+          cache-dependency-path: src/frontend/app/desk/yarn.lock
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+      - name: Build Desk App
+        run: yarn build
+
   build-mails:
     runs-on: ubuntu-latest
     defaults: