ci, ipxe-boot-server: create a python package
Update files to create a python package for ipxe-boot-server. This python package will use the namespace valve_gfx_ci.ipxe-boot-server
Update gitlab-ci.yml to use the same testing job that the other python packages.
Fixes: https://gitlab.freedesktop.org/mupuf/valve-infra/-/issues/181