Configurable -timeout and increased default to 1 minute (from 6 seconds)

[ldemailly]

Fixes #280

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 14.39%. Comparing base (5932d5b) to head (a12019e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
proxy_main.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
+ Coverage   14.33%   14.39%   +0.05%     
==========================================
  Files           4        4              
  Lines         272      271       -1     
==========================================
  Hits           39       39              
+ Misses        231      230       -1     
  Partials        2        2              

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