This isolates the script environment from the rest of the machine,
avoiding missing/incompatible dependencies and avoiding polluting the
rest of the machine with python packages.
Signed-off-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24367>
(cherry picked from commit 75f44bd79a)
