Add dns config option to official feature set

[6543]

as title

[qwerty287]

And docs for dns_search are missing

[woodpecker-bot]

Deployment of preview was torn down

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 27.57%. Comparing base (5d75032) to head (391c4e1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pipeline/backend/kubernetes/pod.go	0.00%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4418      +/-   ##
==========================================
- Coverage   27.58%   27.57%   -0.01%     
==========================================
  Files         381      381              
  Lines       27915    27923       +8     
==========================================
  Hits         7700     7700              
- Misses      19531    19538       +7     
- Partials      684      685       +1     

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