public static Optional<Path> getConfigFile(Map<String, String> envVariables) {
        return getEnvironmentVariable(envVariables, CONFIG_FILE_ENVIRONMENT_VARIABLE).map(Paths::get);
    }
Utility class for retrieving {@link TransportSecurityOptions} from the system.

@author bjorncs
security-utils/src/main/java/com/yahoo/security/tls/TransportSecurityUtils.java