fix: "Too big request header"

[alphanoob1337]

Description

New environment variable READ_BUFFER_SIZE to fix HTTP error 431 "Too big request header" if used in a setup where a lot of Cookies could be present. Solves issue #238.

Please feel free to modify. So far I only tested this as docker image and not when deployed via CLI or with nginx.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (2c8ba9c) 48.13% compared to head (c40695f) 47.90%.

Files	Patch %	Lines
internal/cli/serve/command.go	0.00%	9 Missing ⚠️
internal/http/server.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
- Coverage   48.13%   47.90%   -0.23%     
==========================================
  Files          32       32              
  Lines        1257     1263       +6     
==========================================
  Hits          605      605              
- Misses        614      620       +6     
  Partials       38       38              

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[tarampampam]

👍 Thank you so much for your contribution!