#1013351 apticron: Ability to put the Debian version (eg, bullseye, or 11.3) in CUSTOM_SUBJECT

#1013351#5
Date:
2022-06-22 14:54:40 UTC
From:
To:
Dear Maintainer,

It would be really handy to be able to indicate the specific Debian version
(such as "bullseye" or "11.3") in the subject line of apticron emails.

Currently there's DISTRIB_ID but it only says "Debian".  Could that be
updated to say "Debian 11.3" or "Debian bullseye"?  Or perhaps a new variable
could contain the more specific information?

Thank you!