async function isEnabled() {
  const nodeRedEnabled = await this.gladys.variable.getValue('NODERED_ENABLED', this.serviceId);
  if (nodeRedEnabled === '1') {
    return true;
  }
  return false;
}
@description Checks if Node-RED is ready to use.
@returns {boolean} Is the Node-RED environment ready to use?
@example
await nodeRed.isEnabled();