Which One-Click App are you using? I looked over their list, but couldn't find the Docker Registry. Thanks!
https://caprover.com/docs/app-scaling-and-cluster.html#setup...
I'm not sure about them, but Nexus might fit the bill from that list: https://github.com/caprover/one-click-apps/blob/master/publi...
It's what I'm using for myself (though with just Docker Swarm + Apache2, without Caprover) and has worked well for years.