fix: parseEnvs for expanding env and shell subst

[sunggun-yu]

• do parseEnvs with shell echo to handle both /Users/sunggun and shell subst in consist way
• use os.ExpandEnv to handle /Users/sunggun, and subst env vars of current profile

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1c92017) 93.84% compared to head (44865b6) 94.15%.
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   93.84%   94.15%   +0.31%     
==========================================
  Files          17       18       +1     
  Lines         682      719      +37     
==========================================
+ Hits          640      677      +37     
  Misses         24       24              
  Partials       18       18              

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