feat: enable `require-image-signature` policy as `audit`

chart/templates/kyverno-policies/values.yaml

@@ -160,7 +160,7 @@ policies:
 
   # Kyverno Beta feature - https://kyverno.io/docs/writing-policies/verify-images/
   require-image-signature:
-    enabled: false
+    enabled: true
     validationFailureAction: audit
 
   require-istio-on-namespaces:

tests/test-values.yaml

@@ -411,6 +411,8 @@ kyvernoPolicies:
           - 'kyverno-policies-bbtest/test: required'
           - kyverno-policies-bbtest/required
       require-image-signature:
+        enabled: true
+        validationFailureAction: enforce
         parameters:
           require:
           - imageReferences:
@@ -424,6 +426,8 @@ kyvernoPolicies:
                     MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE8nXRh950IZbRj8Ra/N9sbqOPZrfM
                     5/KAQN0/KjHcorm/J5yctVd7iEcnessRQjU917hmKO6JWVGHpDguIyakZA==
                     -----END PUBLIC KEY-----
+            mutateDigest: false
+            verifyDigest: false 
           - imageReferences:
             - "registry1.dso.mil/ironbank/*"
             attestors: