Add ARMEndpoint to Cluster Class

Adds the ARMEndpoint field for specifying the ARM Resource Manager
Endpoint for use with Azure Stack deployments. The endpoint is
used to configure the environment as well as manage resources.

Author: patrickdillon

api/v1beta1/types_class.go

@@ -78,6 +78,12 @@ type AzureClusterClassSpec struct {
 	// See: https://learn.microsoft.com/azure/reliability/availability-zones-overview
 	// +optional
 	FailureDomains clusterv1.FailureDomains `json:"failureDomains,omitempty"`
+
+	// ARMEndpoint specifies a URL for the ARM Resource Manager endpoint.
+	// It may only be specified when the AzureEnvironment is set to AzureStackCloud,
+	// in which case it is required.
+	// +optional
+	ARMEndpoint string `json:"armEndpoint,omitempty"`
 }
 
 // AzureManagedControlPlaneClassSpec defines the AzureManagedControlPlane properties that may be shared across several azure managed control planes.