ehance: use github app token to clone code instead of ssh key

[wwcchh0123]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 90 lines in your changes missing coverage. Please review.

Project coverage is 29.86%. Comparing base (d1a52f7) to head (96c16d0).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
server.go	0.00%	79 Missing ⚠️
main.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #417      +/-   ##
==========================================
- Coverage   31.41%   29.86%   -1.56%     
==========================================
  Files          28       28              
  Lines        3377     3553     +176     
==========================================
  Hits         1061     1061              
- Misses       2188     2364     +176     
  Partials      128      128              

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