Hello everybody I have a some cluster on rancher.These cluster can not access wlan like as air-gapped cluster.I want to deploy some app from rancher helm section but My cluster could not pull helm operator image from docker hub because as I said my cluster can not access internet.I want to add private registry theese cluster with imagepullsecret parameter.Yes I can add private registry global settings on Rancher dashboard but there is not imagepullsecret section.I need help this issue thanks