on:
  schedule:
    # It's OK. The interval can be every 5 minutes.
    - cron: '*/5 * * * *'
    # It's bad. The interval can't be less than every 5 minutes.
    - cron: '*/4 * * * *'

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - run: echo ...
