Separate RegExp matching of issuer/subject from strict

[vaikas]

Signed-off-by: Ville Aikas vaikas@chainguard.dev

Summary

Add two new fields issuerRegExp and subjectRegExp so that if the user wants RE matching of issuer/subject, it's crystal clear
that RE is being used. issuer / subject are now strict matches only.

Ticket Link

Fixes #1871

Release Note

CIP issuer/subject are now strict matches. Add two new fields issuerRegExp and subjectRegExp that will then use RE for matching.

[codecov-commenter]

Codecov Report

Merging #1956 (b0124b9) into main (2b4d69b) will increase coverage by 0.18%.
The diff coverage is 95.74%.

@@            Coverage Diff             @@
##             main    #1956      +/-   ##
==========================================
+ Coverage   34.71%   34.90%   +0.18%     
==========================================
  Files         153      153              
  Lines       10037    10057      +20     
==========================================
+ Hits         3484     3510      +26     
+ Misses       6166     6162       -4     
+ Partials      387      385       -2     

Impacted Files	Coverage Δ
...g/apis/policy/v1alpha1/clusterimagepolicy_types.go	0.00% <ø> (ø)
...kg/apis/policy/v1beta1/clusterimagepolicy_types.go	0.00% <ø> (ø)
pkg/cosign/kubernetes/webhook/validation.go	74.00% <0.00%> (ø)
...s/policy/v1alpha1/clusterimagepolicy_conversion.go	79.41% <100.00%> (ø)
...s/policy/v1alpha1/clusterimagepolicy_validation.go	94.97% <100.00%> (+1.90%)	⬆️
...is/policy/v1beta1/clusterimagepolicy_validation.go	94.97% <100.00%> (+1.90%)	⬆️
pkg/cosign/verify.go	33.58% <100.00%> (+0.80%)	⬆️

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[hectorj2f]

lgtm

[hectorj2f]

lgtm