Trigger snap build from GitHub Action

As I’ve already mentioned at
Does snap build not trigger by dependency change anymore? if snapcraft.yaml file lives in separate repository, snap build doesn’t trigger on main repo change.
So I try to find workaround and want try to use GitHub Actions to trigger builds. I want use snapcraft.io’s webhook for this task, but unfortunately I can’t find any docs what exactly payload I should put to webhook call to get it working. Github itself sends too many fields and I don’t think all of them are required.

So can anybody clarify what fields I need add to payload to get it working?

Thanks in advance!