feat: add flags support

[tmzane]

Closes #30

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.18%. Comparing base (68d7f27) to head (9dd5265).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
env.go	62.50%	15 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #50      +/-   ##
===========================================
- Coverage   100.00%   93.18%   -6.82%     
===========================================
  Files            4        4              
  Lines          227      264      +37     
===========================================
+ Hits           227      246      +19     
- Misses           0       15      +15     
- Partials         0        3       +3     

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