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/playwright.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from '@playwright/test';
+
+const baseURL = process.env.PLAYWRIGHT_BASE_URL ?? 'http://127.0.0.1:1337';
+
+export default defineConfig({
+  testDir: './e2e',
+  timeout: 120_000,
+  expect: {
+    timeout: 10_000,
+  },
+  retries: process.env.CI ? 1 : 0,
+  use: {
+    baseURL,
+    headless: true,
+    trace: 'on-first-retry',
+  },
+});