Interpolate runs-on with variables when scheduling tasks (#30640)
Follow #29468
1. Interpolate runs-on with variables when scheduling tasks.
2. The `GetVariablesOfRun` function will check if the `Repo` of the run
is nil.
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Co-authored-by: Giteabot <teabot@gitea.io>
(cherry picked from commit 2f6b1c46a1a4a90f56ca0f3ad7840e8e70daeab5)
Conflicts:
services/actions/schedule_tasks.go
trivial conflict because of 'Add vars context to cron jobs (#3059)'
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