How to use a private container registry

## What example? Describe it
How to use a docker image stored in a private container registry?
With v1 sdk, the following settings enable to use a private container registry.
https://learn.microsoft.com/en-us/azure/machine-learning/how-to-train-with-custom-image#use-a-private-container-registry-optional

I cannot find any example by using v2.