Undocumented variable metal_control_plane_host_provider (#507)

Author: AnnaSchreiner

control-plane/README.md

@@ -16,7 +16,7 @@ Contains roles for deploying the metal-control-plane.
 
 ## Variables
 
-The `control-plane-defaults` folder contains defaults that are used by multiple roles in the control-plane directory. You can look up all the default values [here](control-plane-defaults/main.yaml).
+The `defaults` folder contains defaults that are used by multiple roles in the control-plane directory. You can look up all [the default values](roles/defaults/defaults/main.yamlrol-plane-defaults/main.yaml).
 
 | Name                                  | Mandatory | Description                                                                                         |
 | ------------------------------------- | --------- | --------------------------------------------------------------------------------------------------- |
@@ -25,6 +25,7 @@ The `control-plane-defaults` folder contains defaults that are used by multiple
 | metal_control_plane_stage_name        |           | The name of the current stage, can be used for prefixing                                            |
 | metal_control_plane_namespace         |           | The target namespace of all deployed kubernetes resources of the metal-control-plane                |
 | metal_control_plane_image_pull_policy |           | Global value for an ImagePullPolicy that will be used for Kubernetes entities                       |
+| metal_control_plane_host_provider     |           | The control-planes hosting provider, one of `metal` or `gcp`. Required for gardener deployment.     |
 
 ## Roles