Bug in scheduling of CIs via cron job

[KajbaM]

Hello,
I was looking at this repository as a reference for some mirror synchronization magic and how to deal with having own synchronized downstream when I noticed a little error in the setup.

I noticed that there is following piece of yaml code for scheduling in every workflow file:

on:
  schedule: # At every minute past hour 0, 4, 8, 12, 16, and 20.
    - cron: '* 0,4,8,12,16,20 * * *'
  workflow_dispatch: # And manually on button click.

Using git blame on git-sync-zephyr.yml it tracks down to commit 5331b47 with description "gh-workflow: sync 6 times a day"

However, this cron job string will not schedule the job 6 times a day, but rather every single minute of the 6 hours listed.

@rexut