I just added 3 new Steam Decks at my home CI, bringing the total count
to 5. Let's make use of 2 of these to reduce execution time in Mesa CI
and leave the last one available for DXVK-CI.
Signed-off-by: Martin Roukala (né Peres) <martin.roukala@mupuf.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19929>