chore: Add some tests

frontend/e2e/backend.spec.ts

@@ -0,0 +1,8 @@
+import { test, expect } from '@playwright/test';
+
+test('backend works', async ({ page }) => {
+  await page.goto('http://localhost:8080/health');
+  const response = await page.textContent('body');
+  expect(response).toBeTruthy();
+  expect(page.getByText('{"status":"UP"}')).toBeVisible();
+});