i915/ci: use debian-build-testing instead of debian-testing

Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33345>

src/gallium/drivers/i915/ci/gitlab-ci.yml

@@ -4,7 +4,7 @@ include:
 # Manual test rules for using g33 in ondracka r300 farm.
 .ondracka-g33-test:
   extends:
-    - .b2c-x86_64-test-gl
+    - .b2c-x86_64-test-gl-manual # use debian-build-testing rather than debian-testing
     - .i915g-manual-rules
   tags:
     - intelgpu:codename:G33