How do I use update-all-domain feature with systemd-scheduling

[RichardBeisser]

See #19

Originally posted by @mkorthof in #59 (comment)

Hello,

would you be so kindly and explain how to use the update-all-domain feature together with scheduling?
The docu
https://github.com/mkorthof/freenom-script#scheduling
only describes how to add an systemd-service for 1 domain
I want to avoid 5 systemd-services because I have registered 5 domains.

Thanks.