Add option to set custom config file path

[jamacku]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2952a1d) 66.25% compared to head (3286f68) 66.25%.

Files	Patch %	Lines
src/config.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #278   +/-   ##
=======================================
  Coverage   66.25%   66.25%           
=======================================
  Files           4        4           
  Lines         240      240           
  Branches       27       27           
=======================================
  Hits          159      159           
  Misses         81       81           

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