Easiest/Simplest way to get a custom docker image into TrueNAS Scale?

I have created a docker image of a personal application and can not for the life of me figure out how to get TrueNAS Scale to see it?
It is not in a registry for it to be pulled from, because it is a private application.
Do I really have to jump through those hoops, get a private repo set up and all that just to load a SINGLE tiny docker image into TrueNAS Scale?

Please advise if I am missing something or if as the Mandalorians say; "this is the way".