Enable scheduled CI job to sync Gitlab CI (#806)
Enable scheduled CI job to sync Gitlab CI (#806)

* Adds a new CI job, sync_gitlab_with_github, to run the corresponding
  script. This is intended to be used on a schedule and will only run on
  scheduled pipelines.
* Tells all other jobs to _not_ run on scheduled pipelines, so we can
  have a totally separate CI job that just updates Gitlab on a schedule
  without building the rest of the repo.
apple/coremltools,apple/coremltools,apple/coremltools,apple/coremltools