Clear stale Chromium profile locks on startup

tests/vnc-entrypoint.test.ts

@@ -13,4 +13,13 @@ describe('VNC container entrypoint', () => {
       script.indexOf('starting noVNC'),
     );
   });
+
+  it('removes only stale Chromium singleton artifacts before launching the bot', () => {
+    const script = fs.readFileSync(path.resolve('docker/entrypoint.sh'), 'utf8');
+
+    expect(script).toContain('"${BROWSER_SESSION_DIR}/SingletonLock"');
+    expect(script).toContain('"${BROWSER_SESSION_DIR}/SingletonSocket"');
+    expect(script).toContain('"${BROWSER_SESSION_DIR}/SingletonCookie"');
+    expect(script.indexOf('SingletonLock')).toBeLessThan(script.indexOf('launching bot'));
+  });
 });