fix: more robust computation of git directory

[JounQin]

Thanks for @ciyer

close #163

related #90 and #92

[changeset-bot]

🦋 Changeset detected

Latest commit: 2240b56

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
pretty-quick	Patch

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[github-actions]

size-limit report 📦

Path	Size
src/index.ts	955 B (0%)

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[codecov-commenter]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (93924ab) 88.60% compared to head (2240b56) 85.45%.

Files	Patch %	Lines
src/scms/git.ts	40.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
- Coverage   88.60%   85.45%   -3.16%     
==========================================
  Files           8        8              
  Lines         158      165       +7     
  Branches       46       49       +3     
==========================================
+ Hits          140      141       +1     
- Misses         15       21       +6     
  Partials        3        3              

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