✨ Allowing to specify a port for OAuth server

[kipelovets]

Specifying a port is necessary when running in a Docker container

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 37.81%. Comparing base (4401b43) to head (a2d1055).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/gmailctl/localcred/local_provider.go	0.00%	7 Missing ⚠️
cmd/gmailctl/cmd/init_cmd.go	0.00%	3 Missing ⚠️
cmd/gmailctl/localcred/oauth2_server.go	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
- Coverage   37.82%   37.81%   -0.01%     
==========================================
  Files          53       53              
  Lines        4457     4458       +1     
==========================================
  Hits         1686     1686              
- Misses       2684     2685       +1     
  Partials       87       87              

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