fix: append first env without ;

[wangduanduan]

miss the first ; when append env

C:\Users\eddie\AppData\Local\Programs\Zed\binC:\Users\eddie\.g\bin;C:\Users\eddie\.g\go\bin;%GOPATH%\bin;

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.83%. Comparing base (a4bca58) to head (1a77341).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
+ Coverage   48.54%   49.83%   +1.29%     
==========================================
  Files          24       24              
  Lines        1508     1236     -272     
==========================================
- Hits          732      616     -116     
+ Misses        747      591     -156     
  Partials       29       29              

Flag	Coverage Δ
unittests	49.83% <ø> (+1.29%)	⬆️

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