POSIX cron & schedule
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html#tag_20_25_07
GitHub Actions
# 此示例每15分钟触发一次工作流:
on:
schedule:
# * is a special character in YAML so you have to quote this string
- cron: '*/15 * * * *'
- 预定的工作流在默认或基本分支上的最新提交上运行;
- 您可以运行计划的工作流程的最短间隔是每5分钟一次;
https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions
https://help.github.com/en/actions/reference/events-that-trigger-workflows#scheduled-events-schedule