Log info about container (from inside container) when running Batch job

[tamuri]

#1328 got me thinking...

The Azure Batch jobs run inside a specific container. For reproducibility, can we log which container was used (e.g. SHA or tag)? We would need to be able to log information about a container from inside a container.

I came across this which is trying to do such a thing in an agnostic way. There's also a StackOverflow answer but the answers seem hacky.