Keep x11vnc alive for remote login

tests/vnc-entrypoint.test.ts

@@ -0,0 +1,16 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { describe, expect, it } from 'vitest';
+
+describe('VNC container entrypoint', () => {
+  it('starts x11vnc with supported arguments and verifies its port before noVNC', () => {
+    const script = fs.readFileSync(path.resolve('docker/entrypoint.sh'), 'utf8');
+
+    expect(script).not.toContain('-nopw_warn');
+    expect(script).toContain('kill -0 "${X11VNC_PID}"');
+    expect(script).toContain('/dev/tcp/127.0.0.1/${VNC_PORT}');
+    expect(script.indexOf('VNC server is ready')).toBeLessThan(
+      script.indexOf('starting noVNC'),
+    );
+  });
+});