Fix CI tests

[akeeste]

This PR addresses test failures called out #114 (comment):

• Mooring/MooringMatrix - failing on windows due to the accelerator build needing a compiler on the CI
• OWC - license check out failing on ubuntu when PR based (ubuntu when push based and both windows pass...)
  • this passed on a rerun. May be an inconsistent issue or was resolved in some other dependency
• Paraview/OSWEC - failing on windows due to the accelerator build needing a compiler on the CI
• VariableHydro/variableMass - failing due to the model file sphereVarMass being in R2025a(?)

[akeeste]

A few references on adding the MinGW compiler to actions:

• per MATLAB instructions, MinGW is a compiler option to support Simulink models in accelerator and rapid-accelerator modes
• Download/install MinGW on the Actions environment using the setup-mingw Action https://github.com/egor-tensin/setup-mingw/tree/master
• per MATLAB instructions, the MW_MINGW64_LOC environment variable must be defined
• set the environment variable using echo 'COMMANDS' >> $GITHUB_ENV

[akeeste]

A couple notes after looking into this more in the two matlab pages linked above:
MinGW 14.2 is supported as of R2026a
MinGW-w64 version 8.1 for R2023a and later
MinGW-w64 version 6.3 for R2018b and later
MinGW-w64 version 5.3 for R2017b through R2018a
MinGW-w64 version 4.9.2 for R2015b through R2017a

I will need to adjust the version and double check that the install location is correct

[jtgrasb]

I did some additional testing and was able to update the testing script to allow MATLAB to see the MinGW source after installing. I removed the changes to the input files, so it's not testing it here, but the successful tests can be found here.

I also saved the two variable hydro case Simulink files as R2023b, and this fixed the error we were seeing on the CI for those.

I believe this should resolve all of the CI errors.

[akeeste]

Thanks for wrapping this up @jtgrasb ! This solution is pretty slick--searching for the executable itself on that instance of the VM vs trying to figure out where Actions installs it and hardcoding the path in. Tests are passing. merging!

[akeeste]

*Changed to go into main. I'll merge this and then pull main into dev