Automatically log in to Azure Container Registry for push/pull ops #816
Description
This is an idea, not a bug report
Thanks to the awesome work from our Docker friends we have the ability to deploy images (docker run) and Compose projects from Azure Container Registry (ACR) to Azure Container Instances (ACI) without the need to specify ACR pull credentials. This is because the CLI will automatically exchange the Azure management token (result of docker login azure) into a ACR pull token and pass that token to ACI as part of deployment spec.
We could do similar token exchange for pull/push operations for ACR. This means one would be able to push to/pull from ACR without doing docker login someregistry.azurecr.io, as long as the user has done docker login azure and the CLI has valid Azure management token. This would make working with ACR smoother.
Let me know if this sounds like a reasonable idea. If yes, I can put together a PR that implements it.