Commit
c0e6589279d2a9b6dee87d12ac37c5d47c8b58c0
by Vadim Yanitskiy
open5gs-master: migrate to debian-bullseye-build
It's a common practice to have a shared '-build' image and base the '-master' images on top of it to avoid installing same dependencies across different images.
Finally we can use more recent meson from debian's repositories, so no need to depend on python and install it using pip.