Cron job forcibly installs trusted key

The rpm keybase provides for Fedora contains a daily cron job, that, among other things, forcibly installs the keybase key. See `install_rpm_key()` in /etc/cron.daily/keybase.

This action is invisible to the user. Adding a trusted key to the rpm database should be an explicit action.

Inspect install_rpm_key() in /etc/cron.daily/keybase and confirm how the Fedora rpm keybase cron job installs the key. Change the behavior so adding the key to the rpm database requires an explicit user action, then verify that the daily cron job no longer installs it invisibly.

Written by the indexing model from the issue text.