Hi,
to be up to date on my Debian Desktop and profit from the most recent version of Siril and not having to install all the required development packages, I created a gitlab-repository building a deb-package via CI/CD. I made it publicly available. I hope that’s ok for you developers?
You are right, it is in bookworm (testing), but not in the current stable (bullseye). When installing the upstream version under bullseye I had some library conflicts with other software (if I remember right it was hugin), so I build it on my own.