message: Log listening port
  Needed when looking at ECONNREFUSED errors
diff: @@ -214,6 +214,7 @@ app.use(router.allowedMethods());
  const server = http.createServer(app.callback());
  server.listen(0, '127.0.0.1', async () => {
  const { port } = server.address() as AddressInfo;
  + registry.logger.info('Listening for HTTP requests', { port });
  await setupEnv({ port });
  // Environment variables are set, can load whitelisted modules.
  whitelisted.loadModules();
  