catalina-xcode + mesa

[bjlittle]

I'd like to use an osx_instance with a catalina-xcode image, but I also need OpenGL mesa support.

What's the best way to do this on cirrus-ci?

For a Linux container this is easy to do using a dockerfile, but this doesn't seem to extend to osx.

Any guidance would be most welcomed 🙏

[bjlittle]

Just realised that brew is configured.