Improve apps (#19256)

- simplify the base application template
- remove --exhaustive option and replace by a --example option like in
next.js https://nextjs.org/docs/app/api-reference/cli
- Fix some bugs and logs
- add a post-card app in twenty-apps/examples/

packages/twenty-apps/examples/hello-world/.github/workflows/ci.yml

@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request: {}
+
+env:
+  TWENTY_VERSION: latest
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Spawn Twenty instance
+        id: twenty
+        uses: twentyhq/twenty/.github/actions/spawn-twenty-docker-image@main
+        with:
+          twenty-version: ${{ env.TWENTY_VERSION }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Enable Corepack
+        run: corepack enable
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'yarn'
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Run integration tests
+        run: yarn test
+        env:
+          TWENTY_API_URL: ${{ steps.twenty.outputs.server-url }}
+          TWENTY_API_KEY: ${{ steps.twenty.outputs.access-token }}