Add macOS support

[tristanmontoya]

Wanted to use libtrixi on my Mac, so with the help of Codex, I got it to work cross-platform and added a small macOS test workflow.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.11%. Comparing base (26f9aef) to head (63bb35a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #298   +/-   ##
=======================================
  Coverage   96.11%   96.11%           
=======================================
  Files          25       25           
  Lines        1260     1260           
  Branches       74       74           
=======================================
  Hits         1211     1211           
  Misses         45       45           
  Partials        4        4           

Flag	Coverage Δ
unittests	96.11% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[benegee]

Nice to see you here @tristanmontoya ! Thanks for trying and sharing you recipe.

In fact, running t8code on macOS is of great interest as well.

So, did it everything work for you so far. I think it would be nice to integrate macos support!

[sloede]

Awesome! Thanks a lot for this!

Just a few minor comments. I didn't review the ci.yml change - @benegee can you maybe take a look at it?

[sloede]

Why remove the default?

[tristanmontoya]

The default wasn't actually changed for Linux, just wasn't mentioned specifically here. Added back the note saying what the default is, using the generic to denote either .so or .dylib.

[tristanmontoya]

Nice to see you here @tristanmontoya ! Thanks for trying and sharing you recipe.

In fact, running t8code on macOS is of great interest as well.

So, did it everything work for you so far. I think it would be nice to integrate macos support!

So far all is working. I'll let you know if I'm running into any issues. The goal is to try to wrap Trixi.jl in the Basic Model Interface, which will allow it to interface with some of the land models we've been working with at the University of Saskatchewan.