Refactor GitHub Actions workflow for tests

[ViralBShah]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[ViralBShah]

@ChrisRackauckas This doesn't seem to work for x86 and we could just not support that.

It also seems to have issues on windows, which should be fixed before any new release is tagged.

[ChrisRackauckas]

ERROR: LoadError: could not load symbol "SUNContext_Create": that sounds like an issue with the binary?

[ChrisRackauckas]

This doesn't seem to work for x86 and we could just not support that.

I don't think Sundials ever supported. It looks like it's trivial for Claude though since it's just some Int conversions.

[ViralBShah]

The windows is puzzling. I wonder what is going on. Maybe need to check the build logs.

[ViralBShah]

Windows works fine for me. I think there are some static .a files that are in lib that may be confusing matters, and there could be a new build of Sundials that gets rid of them.

The first thing though is to be able to reproduce this issue, but I have no issues precompiling and running tests on Windows (in UTM on my mac). I am seeing test failures though for which I will open a new issue.

[ViralBShah]

I have a feeling that the runners for windows and linux x86 are broken. Is there a way to fix these or reinstall them or something?

[ViralBShah]

In https://github.com/SciML/Sundials.jl/actions/runs/17417995538/job/49450603795, the depot points to /home/chrisrackauckas/.julia. Is that how this is supposed to be?

[ChrisRackauckas]

That's for the runners that are running on deepsea. It's "sufficient", we should probably do some docker thing or something but it works well enough.