Move Calligra to release service

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

KDE Gear 24.08 Beta release

Packages are available at the usual locations. Everything compiles fine for me. Cheers, Albert