We are currently running pip as root which will cause it
to install into /root/.local cause it wants to do a user install
Set the user-base in the gloabl config, /etc/pip.conf, so pip will
both install there and subsequently look there if we invoke it
from any other user.
This makes pip install ofc require elevated permissions, as it
will be writting into /usr/local from now on
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8763>
