azuresdk/azure-cli-python docker image has been retired. Here's the new location.

This Azure CLI docker image has been retired and is no longer available on Docker hub.
https://hub.docker.com/r/azuresdk/azure-cli-python

Apologies if this breaks anything for you.

The new Azure CLI container info can be found here: https://docs.microsoft.com/cli/azure/run-azure-cli-docker