Since reusable workflows are defining inputs and ouputs using the
on.workflow_call syntax, this could also be triggered by a workflow_call
event. That event does not exist within GitHub and we should make
sure our worklow is not called by that kind of 'synthetic' event.
See 74da5b085c (r1042413431)
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>