@Override
        public String lookup(@NonNull final String key) {
            return new String(Base64.getDecoder().decode(key.getBytes(StandardCharsets.UTF_8)), StandardCharsets.UTF_8);
        }
Resolve string with potential secrets

@param toInterpolate potential variables that need to revealed
@return original string with any secrets that could be resolved if secrets could not be
resolved they will be defaulted to default value defined by ':-', otherwise default to empty
String. Secrets are defined as anything enclosed by '${}'
plugin/src/main/java/io/jenkins/plugins/casc/SecretSourceResolver.java