Add dual-stack support

[amold1]

Describe the solution you'd like:
I would like to get cluster-api-provider-rke2 to provide dual-stack support.

Why do you want this feature:
From the docs in the old section, you could pass the cluster and service cidr to the config but looks like that is not supported anymore. The code
says this is not exposed so I am wondering how I can get dual-stack setup to work.
I am following this guide to get dual-stack to work with cilium.

Anything else you would like to add:
MyRKE2ControlPlane spec to add cidr

  serverConfig:
    clusterCidr: 10.192.0.0/10,fd02::/80
    serviceCidr: 10.96.0.0/12,fd03::/108

error on applying

Error from server (BadRequest): error when creating "STDIN": RKE2ControlPlane in version "v1alpha1" cannot be handled as a RKE2ControlPlane: strict decoding error: unknown field "spec.serverConfig.clusterCidr", unknown field "spec.serverConfig.serviceCidr"

If this is indeed already supported, I'd appreciate some guidance/documentation to help me out.

Thanks.

[greenmaid]

I would have the same expectation here. I'm trying to have a dual stack cluster using calico CNI.

It seems that currently capbr does not support multiple pod/service cidrs blocks and only takes only the first one configured

https://github.com/rancher-sandbox/cluster-api-provider-rke2/blob/07eef9b691dcec2d7b9458ef577e8758507a7396/pkg/rke2/config.go#L190-L199

[alexander-demicev]

Closing it for now, we don't have the capacity to work on it.