The control plane pre-update only implemented for docker

[MOZGIII]

I was reading through the whole kubespray and noticed this inconsistency: other container runtimes can potentially be used, but forceful deletion is only implemented for docker.

https://github.com/kubernetes-sigs/kubespray/blob/24dc4cef56848c2efc3a9e050959f4feee92976a/roles/kubernetes/control-plane/tasks/pre-upgrade.yml#L1-L21

Is this an overlook, or is there a reason why this is done this way?

Looks like a bug to me, as it is not checked whether docker is even used at all.

Possible fixes:

• Use crictl there to abstract around the runtime?
• Run commands with nerdctl for containerd too?
• ?