$ rugged add-verification-key --help
Usage: rugged add-verification-key [OPTIONS] ROLE PATH_TO_PUBLIC_KEY
Add a verification key to partial Root metadata.
Options:
--key-type TEXT The type of key to add ('tuf' or 'pem', default 'tuf').
--root-expires TEXT The timestamp that root metadata will expire (eg.
'2123-12-16T16:24:07Z').
--help Show this message and exit.