apply HetznerBareMetalHost labels to resulting node

[Privatecoder]

/kind feature

Describe the solution you'd like

Adding labels to a HetznerBareMetalHost objects metadata can be used for the hostSelector of HetznerBareMetalMachineTemplate however it would be great if these labels would also be applied to the corresponding node in k8s.

An example would be to add Hetzner specific labels such as

apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
kind: HetznerBareMetalHost
metadata:
  name: "test-123"
  labels:
    instance.hetzner.cloud/is-root-server: true

to remove the requirement to label them afterwards on a per-node-basis.

[batistein]

This feature request is out-of-scope for caph.

There is already some work and issues about propagating labels to kubernetes nodes.
Please see:

• Labels and annotations for MachineDeployments and KubeadmControlPlane created by topology controller kubernetes-sigs/cluster-api#7006
• Support syncing a set of labels from MachineDeployment/MachineSet/Machine to Nodes kubernetes-sigs/cluster-api#493
• 📖 Label Sync Between MachineDeployment and underlying Kubernetes Nodes kubernetes-sigs/cluster-api#6255

And the proposal here: https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20220927-label-sync-between-machine-and-nodes.md