CI: consider running on more platforms

We currently aim to release chalk for:

- Linux arm64
- Linux x86_64
- macOS arm64
- macOS x86_64

However, in this repo we currently only test Linux x86_64 builds. To have better/earlier visibility on potential problems that affect a subset of platforms, we could try adding more platforms in CI.

The easiest to add is probably macOS x86_64, except that there's an issue right now that prevented us releasing chalk 0.3.1 (2024-01-23) for that platform.

Start by reviewing the repository's CI configuration and the issue that currently blocks macOS x86_64 releases. Compare the existing Linux x86_64 build with the four target platforms, then verify that CI provides coverage for the added platforms without preventing releases.

Written by the indexing model from the issue text.