Support bare-metal servers with hcloud-cloud-controller-manager

[apricote]

/kind feature

Describe the solution you'd like

Right now you only support Robot (bare-metal) servers when using syself/hetzner-cloud-controller-manager.

hetznercloud/hcloud-cloud-controller-manager (HCCM) added support for Robot servers in December 2023. It would be awesome if you would also support this with CAPH.

Anything else you would like to add:

As far as I could tell, the main problem is that CAPH expects the provider ID for bare-metal servers to be formatted as hcloud://bm-$ROBOTID. HCCM uses the format hrobot://$ROBOTID.

• https://github.com/syself/cluster-api-provider-hetzner/blob/c05f7aadc50cba9fee88a176776a511bb3a83174/api/v1beta1/hetznerbaremetalmachine_types.go#L40-L41
• https://github.com/syself/cluster-api-provider-hetzner/blob/c05f7aadc50cba9fee88a176776a511bb3a83174/pkg/scope/baremetalhost.go#L142-L151
• https://github.com/syself/cluster-api-provider-hetzner/blob/c05f7aadc50cba9fee88a176776a511bb3a83174/controllers/csr_controller.go#L328
• https://github.com/syself/cluster-api-provider-hetzner/blob/c05f7aadc50cba9fee88a176776a511bb3a83174/pkg/services/baremetal/baremetal/baremetal.go#L895-L897

Related to https://github.com/hetznercloud/hcloud-cloud-controller-manager/issues/702

Environment:

• cluster-api-provider-hetzner version:
• Kubernetes version: (use kubectl version)
• OS (e.g. from /etc/os-release):

[janiskemper]

@apricote would you be able to contribute here?