Update Ubuntu base image
While working on the addition of cmake to one of Jpp dependencies (km3net-dataformat) I realized the ubuntu image misses a couple of packages (see pipelines), at least python3-venv and python3-pytest.
I would propose to add them to the base image. And change its name to use a new date then @tgal ?
Do you see any other crucial package that I may have missed in that image ?
Edited by Laurent Aphecetche