code: func (cfg *ClusterConfiguration) GetControlPlaneImageRepository() string {
  	if cfg.CIImageRepository != "" {
  		return cfg.CIImageRepository
  	}
  	return cfg.ImageRepository
  }
docs: // GetControlPlaneImageRepository returns name of image repository
  // for control plane images (API,Controller Manager,Scheduler and Proxy)
  // It will override location with CI registry name in case user requests special
  // Kubernetes version from CI build area.
  // (See: kubeadmconstants.DefaultCIImageRepository)