fix(logs): prevent shfmt environment variable deprecation warning

[benelan]

Prevent consistent warnings in the log file about deprecated shfmt environment variables. The change also slightly improves performance by reducing the iterations.

Alternatively, I could check the shfmt object for environment variable usage instead of skipping them like logLevel. Let me know what you'd prefer!

Fixes #1226

[skovhus]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.91%. Comparing base (5164c63) to head (c4cccaf).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1227      +/-   ##
==========================================
- Coverage   81.13%   80.91%   -0.23%     
==========================================
  Files          29       29              
  Lines        1442     1441       -1     
  Branches      343      344       +1     
==========================================
- Hits         1170     1166       -4     
- Misses        218      221       +3     
  Partials       54       54              

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