CI: Skip flaky CS test on VirGL

We've seen this crash a few times over the past couple of weeks, but
haven't yet managed to reproduce locally and fix. In the meantime, just
skip.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6352>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 22c2ef5..a81a0f4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -966,6 +966,7 @@
     DEQP_VER: gles2
     NIR_VALIDATE: 0
     DEQP_NO_SAVE_RESULTS: 1
+    DEQP_SKIPS: deqp-virgl-gl-skips.txt
     # Don't use threads inside llvmpipe, we've already got all cores
     # busy at the deqp-runner level.
     LP_NUM_THREADS: 0