Use externalIPs when bootstrapping cluster if no InternalIP found for the node

[Unix4ever]

Some infra providers (like Hetzner) do not set InternalIPs in the Machine resource. We may need to have a fallback in the provider which will pick ExternalIPs if no InternalIPs were found on any of the nodes.

This logic should be updated: https://github.com/siderolabs/cluster-api-control-plane-provider-talos/blob/master/controllers/taloscontrolplane_controller.go#L411

[damdo]

+1 for this.

@Unix4ever Would you prefer: A)

• Try to pick an InternalIP from any of the machines
• If no InternalIP is found on any machine, try to pick an ExternalIP from any machine
• If no address is found on any machine throw an error

or B)

• Try to pick an InternalIP from the first machine
• If no InternalIP is found on the first machine, try to pick an ExternalIP from the first machine
• If no *IP is found for the first machine, repeat the two steps above for the next machine
• If no address is found on any machine throw an error

[Unix4ever]

Current logic is that it checks if any of machines do not have InternalIP set. It should remain the same, so the idea will be:

• iterate over the list of the machines.
• try to pick InternalIP from the machine.
• if InternalIP not found, try ExternalIP.
• if no IP found for any of the machines throw an error.