warewulf container related code refactor

Description of the Pull Request (PR):

Unify and refactor container-related code shared between API and wwctl

This fixes or addresses the following GitHub issues:

Fixes sub-issue of #918

Before submitting a PR, make sure you have done the following:

[ ] Signed off on all commits (e.g., using git commit --signoff) in agreement to the DCO
[ ] Read the documentation for contributing to Warewulf
[ ] Added changes to the CHANGELOG if necessary
[ ] Updated userdocs if necessary
[ ] Based this PR against the appropriate branch (typically main)
[ ] Added myself as a contributor to the Contributors File

Apr 24 '24 08:04 JasonYangShadow

@anderbubble this is the first trial of unifying and extracting the common code used between wwctl and API for container-related functions. Feel free to leave comments.

Apr 24 '24 08:04 JasonYangShadow

@JasonYangShadow thank you so much for working on this. I'm sorry for the ordering of things, here; but could you rebase this onto current main? It's got a lot of conflicts after the NodeInfo refactor.

I'd like to start prioritizing this and related work for v4.6.0; so if you can get it rebased, I'll definitely be reviewing / merging it asap.

Thanks! sure, will do that today.

Oct 31 '24 00:10 JasonYangShadow