code: func (kc *kubeClient) getDeployableEnvironmentNamespace(envName string) (string, error) {
  	envNS, pres := kc.envMap[envName]
  	if !pres || !kc.CanDeploy(envName) {
  		return "", errs.Errorf("unknown environment: %s", envName)
  	}
  	return envNS, nil
  }
docs: // getDeployableEnvironmentNamespace finds a namespace with the corresponding environment name.
  // Differs from getEnvironmentNamespace in that the environment must be one where the user can deploy
  // applications