Charlie Marsh 35113c1d06 Enable macOS checks on CI (#1193) ...

## Summary

Enables tests for macOS in CI, using the M1 runners (which are free in
public, but count against our quota in private
repos). For now, I'm just running them on `main` to save quota.

I did the math, and the M1 runners are the best value:

![Screenshot 2024-01-30 at 9 33
36 PM](https://github.com/astral-sh/puffin/assets/1309177/bd5a14b6-740c-487f-bcad-81c0fce5b62e)

Closes #1053.

2024-01-31 15:27:04 +00:00

..

workflows

Enable macOS checks on CI (#1193)

2024-01-31 15:27:04 +00:00