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/e2e/checkbox-list.spec.ts

@@ -0,0 +1,68 @@
+import { expect, test } from '@playwright/test';
+
+const adminEmail = process.env.STRAPI_ADMIN_EMAIL ?? 'admin@example.com';
+const adminPassword = process.env.STRAPI_ADMIN_PASSWORD ?? 'Admin12345';
+const contentTypeName = 'Checkbox Item E2E';
+
+test('custom field works in admin UI', async ({ page }) => {
+  await page.goto('/admin');
+
+  await page.getByLabel(/email/i).fill(adminEmail);
+  await page.getByLabel(/password/i).fill(adminPassword);
+  await page.getByRole('button', { name: /log in|sign in/i }).click();
+  await page.waitForURL(/\/admin(\/)?$/);
+
+  await page.getByRole('link', { name: /content[- ]type builder/i }).click();
+
+  await page.getByRole('button', { name: /create new collection type/i }).click();
+  await page.getByLabel(/display name/i).fill(contentTypeName);
+  await page.getByRole('button', { name: /continue|next/i }).click();
+
+  await page.getByRole('button', { name: /add (another|new) field/i }).click();
+  const searchInput = page.getByPlaceholder(/search/i);
+  if (await searchInput.count()) {
+    await searchInput.fill('checkbox');
+  }
+  await page.getByRole('button', { name: /checkbox list/i }).click();
+
+  await page.getByLabel(/name/i).fill('choices');
+  await page.getByLabel(/values/i).fill('alpha\nbeta\ngamma');
+
+  await page.getByRole('tab', { name: /advanced/i }).click();
+  await page.getByLabel(/required field/i).check();
+  await page.getByRole('button', { name: /select default values/i }).click();
+  await page.getByRole('option', { name: 'alpha' }).click();
+  await page.keyboard.press('Escape');
+
+  await page.getByRole('button', { name: /finish|save/i }).click();
+  await page.getByRole('button', { name: /save/i }).click();
+  await expect(page.getByText(/saved/i)).toBeVisible({ timeout: 60_000 });
+
+  await page.getByRole('link', { name: /content[- ]type builder/i }).click();
+  await page.getByText(contentTypeName).click();
+  await page.getByText('choices').click();
+  await page.getByLabel(/values/i).fill('alpha\nbeta\ngamma\ndelta');
+  await page.getByRole('button', { name: /finish|save/i }).click();
+  await page.getByRole('button', { name: /save/i }).click();
+  await expect(page.getByText(/saved/i)).toBeVisible({ timeout: 60_000 });
+
+  await page.getByRole('link', { name: /content manager/i }).click();
+  await page.getByRole('link', { name: /checkbox item e2e/i }).click();
+  await page.getByRole('button', { name: /create new entry/i }).click();
+
+  const alphaCheckbox = page.getByRole('checkbox', { name: 'alpha' });
+  await expect(alphaCheckbox).toBeChecked();
+
+  await alphaCheckbox.click();
+  await page.getByRole('button', { name: /save/i }).click();
+  await expect(page.getByText(/required/i)).toBeVisible();
+
+  await page.getByRole('checkbox', { name: 'beta' }).check();
+  await page.getByRole('checkbox', { name: 'delta' }).check();
+  await page.getByRole('button', { name: /save/i }).click();
+  await expect(page.getByText(/saved/i)).toBeVisible();
+
+  await page.getByRole('checkbox', { name: 'gamma' }).check();
+  await page.getByRole('button', { name: /save/i }).click();
+  await expect(page.getByText(/saved/i)).toBeVisible();
+});