advanced container image pruning

[reubenmiller]

Support more advanced container image pruning:

• Semver version sorting (though this will require the to use the org.opencontainer.image.version field, or having a meaningful version in the tag). Version sorting is desired over creation date.
• Only keep last N Versions (to allow the user to rollback to previous versions without having to download it again)
• Still keep newer image after a rollback so the install can be retried without having to download the image again