Move Calligra to release service

[Carl Schwan]

Hi,

I ported some times ago Calligra to Qt6 and I would propose adding Calligra to 
release service starting with 24.12. I wanted to do do that already for 24.08 
but forgot, so I probably will soon do an independent release.

By Calligra, I mean only the office/calligra repo on invent, not any of the 
project who spitted from the main repo (e.g. Kexi, Calligra Plan).

Cheers,
Carl