CI : workflow validate.yml, manifeste ci.required:true, package.json avec scripts verify

- Ajout .gitea/workflows/validate.yml (runs-on: ci-node22, test de contrat)
- Ajout package.json avec scripts test/check/build/verify
- Ajout ci.required:true dans app.json

.gitea/workflows/validate.yml

@@ -0,0 +1,26 @@
+name: Validation applicative
+
+on:
+  push:
+    branches: [main, master]
+    paths-ignore:
+      - "**.md"
+      - "docs/**"
+  pull_request:
+    branches: [main, master]
+    paths-ignore:
+      - "**.md"
+      - "docs/**"
+  workflow_dispatch:
+
+jobs:
+  verify:
+    name: Tests de contrat
+    runs-on: ci-node22
+    timeout-minutes: 5
+    steps:
+      - name: Récupérer les sources
+        uses: actions/checkout@v4
+
+      - name: Vérifier le contrat du portail
+        run: node test/portal-contract.test.js