Fix sing file installer

[mikemhenry]

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[mikemhenry]

@IAlibay this fixes it, I think I made changes to the single file installer without testing them, since I know the syntax of mamba-org/setup-micromamba@v1 hasn't changed but I may have changed it from the old one after our last release

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a3b5305) 92.82% compared to head (195bdf3) 90.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #667      +/-   ##
==========================================
- Coverage   92.82%   90.99%   -1.83%     
==========================================
  Files         128      128              
  Lines        8711     8711              
==========================================
- Hits         8086     7927     -159     
- Misses        625      784     +159     

Flag	Coverage Δ
fast-tests	90.99% <ø> (?)
slow-tests	?

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