To be fair, unless Apple collaborated with Microsoft before the launch, it's not trivial to add that as a target to the pipeline in a production ready environment. I'm not even sure Apple allows any virtualized instance which poses a major impediment to implementing this. One can always use a self hosted runner to make it work.
I'm not saying this is what happened, I'm just saying this is the type of situation where an MS-owned github could have interests un-aligned with developers, where it might not be the case with an independent github
