Pass AWS credentials if src and dst are in private ECRs of different accounts

[etix-git]

The goal: regular syncing images between two private ECRs
The guide mentions that I *** either need to set environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY for the AWS account you want to use ***
I'm wondering is there a way to configure the auto-refresh feature in case the source registry has one set of creds, and the target has the another-one?
It will be useful in case of syncing the usual private repos with the repos in special AWS regions (I mean Gov or China) where the cross accounts trust policies may be quite complicated.