private void addLinks(RunImageConfiguration runConfig, List<String> ret) {
        // Custom networks can have circular links, no need to be considered for the starting order.
        if (!runConfig.getNetworkingConfig().isCustomNetwork()) {
            for (String[] link : EnvUtil.splitOnLastColon(runConfig.getLinks())) {
                ret.add(link[0]);
            }
        }
    }
Override externalConfiguration when defined via special property.

@param externalConfiguration Map with alternative config
src/main/java/io/fabric8/maven/docker/config/ImageConfiguration.java