give up on installing the signing key on RPM
give up on installing the signing key on RPM

Installing a key can't be done during our RPM install, because it
requires the same global lock we're already holding. Bah. Rather than
installing a whole cronjob just to handle this, we'll let RPM fetch it
automatically when it's used, and the user will just have to approve it.

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client