Add Mac CI build for aarch64 (Mac M1)
We do test building for aarch64 for Android which gives some coverage, but would be good to have Mac aarch64 CI target as that is a primary platform for us, and PhysX codebase can fail specifically on it as showin in #133.
Not sure if the would nicely cross-compile from the existing Mac x86 agents, or if we should wait until GitHub has Mac aarch64 native agents (could take a long time).
Probably will just wait until GitHub Actions has built-in support for this. We are actively building and running published releases of physx-rs from this repo on aarch64 Mac on our own infra until then.
Oops, closed in #183
https://github.com/EmbarkStudios/physx-rs/blob/49176ebed029614e8e5072ce18c4440b99e82f08/.github/workflows/ci.yaml#L76-L94