Question: Azure DevOps extension in offline environments

How to set up the Azure DevOps extension in an **offline environment**?

I see that the Azure CLI supports installing from a local source like this:
` az extension add –source …`

… but this doesn't seem to be enough. (It fails when it runs "pip", which tries to connect to public sources…).

Any tips on how an offline / or x-copy-like deployment looks like?