docs: public static List<DependencyNode> getExtraDependencies(List<DependencyNode> nodes) {
          ExtraArtifactsHandler fetcher = new ExtraArtifactsHandler(nodes);
  
          if (isSet("thorntail.download.sources")) {
              fetcher.addWithClassifier("sources");
          }
  
          if (isSet("thorntail.download.poms")) {
              fetcher.addWithExtension("pom");
          }
  
          if (isSet("thorntail.download.javadocs")) {
              fetcher.addWithClassifier("javadoc");
          }
  
          return fetcher.output;
      }