@Override
        public String lookup(String key) {
            LOGGER.log(
                    Level.WARNING,
                    String.format(
                            "Configuration import: Found unresolved variable '%s'. Will default to empty string", key));
            return "";
        }
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