Test and build on macOS and Windows. #580
Description
Context
Currently, our CI pipeline only runs tests and builds on Linux. While this lines up with our initial platform support targets, we'll eventually need to support macOS and Windows. Unfortunately, our inherent support for these platforms, simply as part of needing to support them because a given developer utilizes those platforms, is weak at best.
We should look into what it will take to start running tests and building ADP on both macOS and Windows CI runners to jumpstart the process of having more full-fledged cross-platform support.