ci: Fix weird filesystem globs appearing in failed test .qpa files.

ci: Fix weird filesystem globs appearing in failed test .qpa files.

When you get a filure and go looking in the results, you'll find weird stuff like this in the XML:

Reference images fill undefined pixels with 3x3 grid pattern.
Attachment 0 (p' = p bin boot builds
dEQP-VK.renderpass.suballocation.attachment_allocation.grow_shrink.89.qpa
deqp dev etc home init install lib media mnt proc results root run sbin
set-job-env-vars.sh sys tmp usr var (1, 1, 1, 1) + (-1, -1, -1, 1))

because we were not quoting the line and 'p *' was getting expanded.

Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5435>