Support for GH_HOST environment variable

[seachicken]

Resolves #125

https://cli.github.com/manual/gh_help_environment

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.11%. Comparing base (211a4d0) to head (c9be6f2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/root.go	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   82.32%   82.11%   -0.22%     
==========================================
  Files           7        7              
  Lines         979      984       +5     
==========================================
+ Hits          806      808       +2     
- Misses        143      146       +3     
  Partials       30       30              

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