zink/ci: automatically reboot when hitting a kernel BUG on vangogh

By rebooting immediately after hitting "BUG", we'll re-try immediately
running the job without first needing to hit the 30 minutes timeout.

Signed-off-by: Martin Roukala (né Peres) <martin.roukala@mupuf.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25107>

src/gallium/drivers/zink/ci/gitlab-ci.yml

@@ -255,6 +255,8 @@ zink-radv-vangogh-valve:
     - .zink-radv-rules
   variables:
     GPU_VERSION: zink-radv-vangogh
+    B2C_SESSION_REBOOT_REGEX: 'BUG: kernel NULL pointer dereference, address'
+    B2C_TIMEOUT_BOOT_RETRIES: 1
   # Override the list of tags to drop `priority:low`
   tags:
     - amdgpu:codename:VANGOGH