fix build
build is broken right now as somewhere in the dependencies there is a module encryption, which needs rust as of today(?) - compare https://github.com/pyca/cryptography/issues/5771 .
and I thought we have a reproducible build :-/
looking into the build process may also be a good opportuunity to look into multi stage builds to better separate build and runtime environments
Edited by Ubbo Veentjer