fix(config): respect cacert on oidc-issuers

[hown3d]

Closes #2097

Summary

Respect the ca-cert field in the prepare method when creating oidc providers.

Release Note

fix(config): respect cacert on oidc-issuers

Documentation

[haydentherapper]

Thank you for fixing this!

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 12 lines in your changes missing coverage. Please review.

Project coverage is 43.32%. Comparing base (cf238ac) to head (197d5b9).
Report is 433 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/config/config.go	55.55%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2098       +/-   ##
===========================================
- Coverage   57.93%   43.32%   -14.62%     
===========================================
  Files          50       72       +22     
  Lines        3119     5676     +2557     
===========================================
+ Hits         1807     2459      +652     
- Misses       1154     2991     +1837     
- Partials      158      226       +68     

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