c093a09660
The previous check used a directory path without the filename, causing
`curl` to return 404 and always fall back to the fork's URL. Add the
rootfs filename to ensure the check works as intended.
Fixes: 13db56320b ("ci/baremetal: Use container rootfs")
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34873>