[#847] fix: digraph: overload multiple dotenv files

[yottahmd]

Issue: #847

Changes:

• Fixed the issue so that .env files properly override one another when multiple files are specified.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.48%. Comparing base (6db86b9) to head (59bcdb3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/digraph/builder.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #849   +/-   ##
=======================================
  Coverage   55.47%   55.48%           
=======================================
  Files          75       75           
  Lines        8171     8170    -1     
=======================================
  Hits         4533     4533           
+ Misses       3242     3241    -1     
  Partials      396      396           

Files with missing lines	Coverage Δ
internal/digraph/builder.go	58.33% <0.00%> (+0.10%)	⬆️

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