In basic pipeline job,

   I set "Build periodically" in 3:00 AM, and there is not commit in jenkinsfile's scm.

   The job don't run at 3:00 AM.

   If I commit something to jenkinsfile's scm, it will be work.

    Why "Build periodically" have the same ability with "Poll SCM"?

   I checkout code in jenkinsfile, I just want the pipeline job Build periodically.

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