github action to create PR style in mapbox for review

[mcbeth]

Also when we merge to main, push data to default style.
I have no idea how to do this

[mmertsock]

Yes, we need to make it far less onerous to update map data, and this is essential to achieve that. I do have some ideas on how to implement this, along with generally simplifying the data model, etc. The main blocker is that I have not been good at making time to work on TrailsRoc lately.