chore: use CEL validation for KubevirtClusterTemplate instead of webhook

Author: aamoyel

api/v1alpha1/kubevirtclustertemplate_types.go

@@ -34,12 +34,12 @@ type KubevirtClusterTemplateSpec struct {
 
 // +kubebuilder:object:root=true
 // +kubebuilder:resource:path=kubevirtclustertemplates,scope=Namespaced,categories=cluster-api,shortName=kct
+// +kubebuilder:validation:XValidation:rule="self == oldSelf", message="KubevirtClusterTemplate is immutable"
 
 // KubevirtClusterTemplate is the Schema for the kubevirtclustertemplates API.
 type KubevirtClusterTemplate struct {
 	metav1.TypeMeta   `json:",inline"`
 	metav1.ObjectMeta `json:"metadata,omitempty"`
-
 	Spec KubevirtClusterTemplateSpec `json:"spec,omitempty"`
 }
 

api/v1alpha1/kubevirtclustertemplate_webhook.go

@@ -6,27 +6,6 @@ metadata:
   creationTimestamp: null
   name: validating-webhook-configuration
 webhooks:
-- admissionReviewVersions:
-  - v1beta1
-  clientConfig:
-    service:
-      name: webhook-service
-      namespace: system
-      path: /validate-infrastructure-cluster-x-k8s-io-v1alpha1-kubevirtclustertemplate
-  failurePolicy: Fail
-  matchPolicy: Equivalent
-  name: validation.kubevirtclustertemplate.infrastructure.cluster.x-k8s.io
-  rules:
-  - apiGroups:
-    - infrastructure.cluster.x-k8s.io
-    apiVersions:
-    - v1alpha1
-    operations:
-    - CREATE
-    - UPDATE
-    resources:
-    - kubevirtclustertemplates
-  sideEffects: None
 - admissionReviewVersions:
   - v1beta1
   clientConfig: