feat(controller): support git repos with self-signed cert

[krancour]

Fixes #1224

I verified this against gitea in a local cluster with ingress and a self-signed cert.

Worked as expected.

cc @geowalrus4gh, I think you were looking for this.

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (bdc19b2) 45.56% compared to head (e5c2a93) 45.59%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/controller/warehouses/git.go	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1366      +/-   ##
==========================================
+ Coverage   45.56%   45.59%   +0.03%     
==========================================
  Files         135      135              
  Lines       11657    11664       +7     
==========================================
+ Hits         5311     5318       +7     
  Misses       6155     6155              
  Partials      191      191              

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[gdsoumya]

LGTM