feat: mac support for ram cache

[mikejgray]

Currently, the behavior of the RAM temp cache is to check for a posix result from os.name. Mac OS is a posix-based OS but the library in use only supports Linux. So, this PR makes it so the tempfile is only created if the OS is detected as Linux.

Not a hard requirement for Mac support but it gets rid of an annoying traceback. :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.53%. Comparing base (e711cee) to head (32b4204).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #231      +/-   ##
==========================================
+ Coverage   42.45%   42.53%   +0.08%     
==========================================
  Files          31       31              
  Lines        3060     3061       +1     
==========================================
+ Hits         1299     1302       +3     
+ Misses       1761     1759       -2     

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