signature/policy_eval.go
func policyIdentityLogName(ref types.ImageReference) string {
	return ref.Transport().Name() + ":" + ref.PolicyConfigurationIdentity()
}
func policyIdentityLogName(ref types.ImageReference) string {
	return ref.Transport().Name() + ":" + ref.PolicyConfigurationIdentity()
}
// policyIdentityLogName returns a string description of the image identity for policy purposes.
// ONLY use this for log messages, not for any decisions!