The `mv` command is typically used to rename files in a Linux
environment, so keep that convention here for container rename.
Signed-off-by: Jonathon Anderson <janderson@ciq.com>
The original implementation presented a warning if more than two
arguments were presented, and didn't handle the case where fewer than
two arguments were provided. This change requires precisely two
arguments and returns an error otherwise.
Signed-off-by: Jonathon Anderson <janderson@ciq.com>
