Add netrc option for config/registry extension

[qwerty287]

just like the option added in #6252

[woodpecker-bot]

Surge PR preview deployment was removed

[codecov]

Codecov Report

❌ Patch coverage is 52.94118% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.85%. Comparing base (739344c) to head (85561cb).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
server/api/repo.go	0.00%	6 Missing ⚠️
server/services/manager.go	0.00%	4 Missing ⚠️
server/services/config/http.go	62.50%	2 Missing and 1 partial ⚠️
server/services/setup.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6333      +/-   ##
==========================================
+ Coverage   33.84%   33.85%   +0.01%     
==========================================
  Files         422      422              
  Lines       28427    28436       +9     
==========================================
+ Hits         9622     9628       +6     
- Misses      17910    17914       +4     
+ Partials      895      894       -1     

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