Support for ClusterClass

[prometherion]

The ClusterTopology Cluster API feature allows the creation of clusters based on a class.

This requires the Kamaji Control Plane provider to offer a new API resource named KamajiControlPlaneTemplate, which is a 1:1 copy of the specification (YMMV) with the removal of fields that would be useless when replicating a Control Plane (e.g.: IP address).

[hexchen]

As far as I can tell from briefly looking at the implementations of other providers as well as the documentation, implementing this might really only require providing a new CRD for the KamajiControlPlaneTemplate resource. I think that the actual templating is done by the capi-controller-manager.

E.g. https://github.com/kubernetes-sigs/cluster-api/blob/main/controlplane/kubeadm/internal/webhooks/kubeadmcontrolplanetemplate.go only does some input validation and enforces the immutability of the KubeadmControlPlaneTemplate.

[chess-knight]

See #107

[prometherion]

Implemented with #107, ready to get shipped with v0.10.0.

The discussion can be closed, any bug report must be filled via Issues, unless a new enhancement proposal is proposed.