145a5cd414
Scheduled pipelines don't have `changes`, so the rule I added in
fa4dd110986083105604 won't match; re-do that but as its own rule,
without the additional `changes` condition.
Fixes: 7c0b19a607 ("ci: run python-test automatically only in merge pipelines")
Fixes: fa4dd110986083105604 ("ci: fix nightly build")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28561>