[Feature request] List container size using reg server

[mikkeschiren]

I think it would be a real nice addon to also add container size in the list of containers tags.

[arthurzenika]

We would be interested in this feature too !

[baptiste-dauphin]

In my case, my goal is to identify the repo which use the storage the most. So, yes ! I would be a great feature ! ;)
👍 👍

[liboz]

I made a PR in #215 that should do this. Hopefully it helps out other people.