Enhance testing and integration for checkbox-list custom field

- Updated Gitea workflow to trigger on pushes to the master branch and refined job configurations for testing and E2E processes.
- Added Jest and Playwright configurations for integration and E2E testing.
- Introduced new checkbox-item API with corresponding controller, service, and routes.
- Created integration tests for the checkbox-list functionality, ensuring proper handling of required fields and default values.
- Updated package.json and package-lock.json to include necessary dependencies for testing.

playground/package.json

@@ -9,9 +9,11 @@
     "deploy": "strapi deploy",
     "dev": "strapi develop",
     "develop": "strapi develop",
+    "e2e": "playwright test",
     "seed:example": "node ./scripts/seed.js",
     "start": "strapi start",
     "strapi": "strapi",
+    "test:integration": "NODE_ENV=test STRAPI_DISABLE_ADMIN=true jest --runInBand",
     "upgrade": "npx @strapi/upgrade latest",
     "upgrade:dry": "npx @strapi/upgrade latest --dry"
   },
@@ -29,9 +31,12 @@
     "styled-components": "^6.0.0"
   },
   "devDependencies": {
+    "@playwright/test": "^1.53.0",
     "@types/node": "^20",
     "@types/react": "^18",
     "@types/react-dom": "^18",
+    "jest": "^29.7.0",
+    "supertest": "^7.0.0",
     "typescript": "^5"
   },
   "engines": {