Move kubernetes CA handling in config.prepare

[ccordoui]

Summary

Resolves #1453

Release Note

• Fix a bug where fulcio wasn't passing http custom configuration to go-oidc

Documentation

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (49eee1e) 57.67% compared to head (10423a4) 57.66%.

❗ Current head 10423a4 differs from pull request most recent head 2bbcda5. Consider uploading reports for the commit 2bbcda5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1454      +/-   ##
==========================================
- Coverage   57.67%   57.66%   -0.02%     
==========================================
  Files          50       50              
  Lines        3112     3118       +6     
==========================================
+ Hits         1795     1798       +3     
- Misses       1158     1160       +2     
- Partials      159      160       +1     

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[ccordoui]

config.prepare is called two times:

• config.go#L459
• config.go#L409

The first time was after the import of the CA of kubernetes config.go#L433 but the second was not.

So to prevent that kind of behavior, I have moved the code in the prepare, like this it is always called before.

[haydentherapper]

@ccordoui Have you been able to compile Fulcio locally and confirm this is working for you?

[ccordoui]

@ccordoui Have you been able to compile Fulcio locally and confirm this is working for you?

@haydentherapper Yes, the built image can be found here quay.io/ccordoui/sigstore/fulcio:ccordoui-pr1454