add macos_arm64 exe

[e-perl-NOAA]

Add SS3 executable for the arm64 version of macs.

[codecov]

Codecov Report

Attention: Patch coverage is 45.45455% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 69.75%. Comparing base (504429a) to head (3237fe8).
Report is 1 commits behind head on main.

Files	Patch %	Lines
R/runSS.R	45.45%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
- Coverage   69.76%   69.75%   -0.01%     
==========================================
  Files          21       21              
  Lines        4385     4387       +2     
==========================================
+ Hits         3059     3060       +1     
- Misses       1326     1327       +1     

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[k-doering-NOAA]

Looks good! I had one comment that I'm not sure is relevant.

I also would like to squash the 5 commits before rebasing this commit into main, so I plan to do that once the comment is addressed.