Add E2E workflow to headlamp-argocd-plugin

- Adds E2E workflow with deploy/teardown scripts
- Adds Playwright smoke tests for ArgoCD sidebar and app list
- Uses unique release name to avoid collision with shared runner

e2e/argocd.spec.ts

@@ -0,0 +1,18 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('ArgoCD plugin smoke tests', () => {
+  test('sidebar contains ArgoCD entry', async ({ page }) => {
+    await page.goto('/');
+    const sidebar = page.getByRole('navigation', { name: 'Navigation' });
+    await expect(sidebar).toBeVisible({ timeout: 15_000 });
+    await expect(sidebar.getByRole('button', { name: 'ArgoCD' })).toBeVisible();
+  });
+
+  test('applications list page loads', async ({ page }) => {
+    await page.goto('/c/main/argocd');
+
+    await expect(
+      page.getByRole('heading', { name: /argo.*cd/i })
+    ).toBeVisible({ timeout: 15_000 });
+  });
+});

e2e/auth.setup.ts

@@ -0,0 +1,34 @@
+import { test as setup, expect, Page } from '@playwright/test';
+
+const AUTH_STATE_PATH = 'e2e/.auth/state.json';
+
+async function authenticateWithToken(page: Page, token: string): Promise<void> {
+  await page.goto('/');
+  await page.waitForURL(/\/(login|token)$/);
+
+  if (page.url().includes('/login')) {
+    const useTokenBtn = page.getByRole('button', { name: /use a token/i });
+    await useTokenBtn.waitFor({ state: 'visible', timeout: 15_000 });
+    await useTokenBtn.click();
+    await page.waitForURL('**/token');
+  }
+
+  await page.getByRole('textbox', { name: /id token/i }).fill(token);
+  await page.getByRole('button', { name: /authenticate/i }).click();
+
+  await expect(page.getByRole('navigation', { name: 'Navigation' })).toBeVisible({
+    timeout: 15_000,
+  });
+}
+
+setup('authenticate with Headlamp', async ({ page }) => {
+  const token = process.env.HEADLAMP_TOKEN;
+
+  if (!token) {
+    throw new Error('Set HEADLAMP_TOKEN for token auth');
+  }
+
+  await authenticateWithToken(page, token);
+
+  await page.context().storageState({ path: AUTH_STATE_PATH });
+});