Bring back the spec.apiEndpoint but make it optional.

We need this indirection because we need to make the removal in two
steps so that the potentially different versions of the CRD in host and
member stay compatible.

api/v1alpha1/docs/apiref.adoc

@@ -3063,8 +3063,6 @@ Supported condition types: ConditionReady + |  |
 |===
 
 
-
-
 [id="{anchor_prefix}-github-com-codeready-toolchain-api-api-v1alpha1-tiertemplate"]
 ==== TierTemplate
 
@@ -3336,6 +3334,15 @@ ToolchainClusterSpec defines the desired state of ToolchainCluster
 [cols="20a,50a,15a,15a", options="header"]
 |===
 | Field | Description | Default | Validation
+| *`apiEndpoint`* __string__ | The API endpoint of the member cluster. This can be a hostname, +
+hostname:port, IP or IP:port. +
+
+
+Be aware that this is kept in the spec only for compatibility reasons +
+and doesn't serve any purpose. Use the Status.APIEndpoint instead. +
+
+
+Deprecated: This is not used for anything. + |  | 
 | *`secretRef`* __xref:{anchor_prefix}-github-com-codeready-toolchain-api-api-v1alpha1-localsecretreference[$$LocalSecretReference$$]__ | Name of the secret containing the kubeconfig required to connect +
 to the cluster. + |  | 
 |===

api/v1alpha1/toolchaincluster_types.go

@@ -24,6 +24,16 @@ const (
 // ToolchainClusterSpec defines the desired state of ToolchainCluster
 // +k8s:openapi-gen=true
 type ToolchainClusterSpec struct {
+	// The API endpoint of the member cluster. This can be a hostname,
+	// hostname:port, IP or IP:port.
+	//
+	// Be aware that this is kept in the spec only for compatibility reasons
+	// and doesn't serve any purpose. Use the Status.APIEndpoint instead.
+	//
+	// Deprecated: This is not used for anything.
+	// +optional
+	APIEndpoint string `json:"apiEndpoint,omitempty"`
+
 	// Name of the secret containing the kubeconfig required to connect
 	// to the cluster.
 	SecretRef LocalSecretReference `json:"secretRef"`