fix controller: use Service's TargetPort

instead of NodePort which is usually "0"
for updating RayCluster's `status.endpoints`.

follow up to ray-project#341

ray-operator/controllers/ray/raycluster_controller.go

@@ -684,10 +684,16 @@ func (r *RayClusterReconciler) updateStatus(instance *rayiov1alpha1.RayCluster)
 		}
 		for _, port := range svc.Spec.Ports {
 			if len(port.Name) == 0 {
-				r.Log.Info("updateStatus", "service port name is empty", port)
+				r.Log.Info("updateStatus", "service port's name is empty. Not adding it to RayCluster status.endpoints", port)
 				continue
 			}
-			instance.Status.Endpoints[port.Name] = fmt.Sprintf("%d", port.NodePort)
+			if port.TargetPort.IntVal != 0 {
+				instance.Status.Endpoints[port.Name] = fmt.Sprintf("%d", port.TargetPort.IntVal)
+			} else if port.TargetPort.StrVal != "" {
+				instance.Status.Endpoints[port.Name] = port.TargetPort.StrVal
+			} else {
+				r.Log.Info("updateStatus", "service port's targetPort is empty. Not adding it to RayCluster status.endpoints", port)
+			}
 		}
 	}
 	timeNow := metav1.Now()