code: func setControlPlaneTolerationOnPodSpec(podSpec *v1.PodSpec) {
  	if podSpec.Tolerations == nil {
  		podSpec.Tolerations = []v1.Toleration{kubeadmconstants.ControlPlaneToleration}
  		return
  	}
  
  	podSpec.Tolerations = append(podSpec.Tolerations, kubeadmconstants.ControlPlaneToleration)
  }
docs: // setControlPlaneTolerationOnPodSpec makes the Pod tolerate the control-plane taint