bug#59180: [berlin] configure mumi <- debbugs sync via an rsync service

[Felix Lechner via Bug reports for GNU Guix]

Hi Maxim,

Here is rsync service I use [1] in case that's helpful.

Kind regards
Felix

[1]
https://codeberg.org/lechner/system-config/src/commit/bf38906f52526d9d8a2bb92489b3bd51d0e7d713/host/wallace-server/operating-system.scm#L633-L651