As the manual suggests running a certbot command to view the issued
certificates, add it to the profile.
* gnu/services/certbot.scm (certbot-service-type): Extend profile-service-type
with certbot-configuration-package.
Change-Id: I92618597bbdc8d838420b2e0f82de601b0bc609b
Signed-off-by: Ludovic Courtès <ludo@gnu.org>