Don't delete generated domain

[ZITADOPER-1]

src/internal/controller/zitadelcluster_controller.go

@@ -395,11 +395,13 @@ func (r *ZitadelClusterReconciler) reconcileDefaultInstance(ctx context.Context,
 				if instance.Id != zitadel.Status.DefaultInstanceId || zitadel.Status.DefaultInstanceId == "" {
 					for _, domain := range instance.Domains {
 						if domain != nil {
-							if _, err := ztdClient.RemoveDomain(ctx, &pb.RemoveDomainRequest{
-								InstanceId: instance.Id,
-								Domain:     domain.Domain,
-							}); err != nil {
-								return ctrl.Result{}, fmt.Errorf("Error removing domain in instance: %v", err)
+							if !domain.Generated {
+								if _, err := ztdClient.RemoveDomain(ctx, &pb.RemoveDomainRequest{
+									InstanceId: instance.Id,
+									Domain:     domain.Domain,
+								}); err != nil {
+									return ctrl.Result{}, fmt.Errorf("Error removing domain in instance: %v", err)
+								}
 							}
 						}
 					}