* modules/rosenthal/services/mail.scm (home-goimapnotify-configuration): Add wait option. (home-goimapnotify-shepherd): Use it.
* modules/rosenthal/services/mail.scm (<home-goimapnotify-configuration>): New data type. (home-goimapnotify-shepherd): New procedure. (home-goimapnotify-service-type): New variable.