Suggestion: Add versions of container images

[ColinShark]

Pretty much as the title says, it'd be neat to have the current version of an image as well as the new version being listed next to the containers with updates available.

For example:

Containers with updates available:
01 - booklore (v2.0.6 -> v2.1.0)

[mag37]

I'd love to easily implement this, though it has been discussed a few times before, see #159 and #165 for some of it.

I've got a few comments in my notes to try to explore this further, but what I've tested is to try to grab info with

--format '{{ index .Config.Labels "org.opencontainers.image.version" }}'
--format '{{ index .Config.Labels "org.opencontainers.image.ref.name" }}'
--format '{{ index .Config.Labels "org.label-schema.version" }}'

But it's very inconsistent.

If anyone finds a good way to do this that seems consistent no matter the source of the container (different creators etc), I'd love to hear!

This is not something I'll currently pursue but I happily receive suggestions if someone else want to dig deeper.

[ColinShark]

That's very fair. Thanks for the swift reply anyway!