in src/org/apache/jackrabbit/vault/PipelineSupport.groovy [71:73]
def stepsForMainAndAdditional(String stepsLabel, Set<String> nodeLabels, Set<Integer> jdkVersions, Set<String> mavenVersions, Closure closure) {
stepsFor(stepsLabel, nodeLabels.plus(mainNodeLabel), jdkVersions.plus(mainJdkVersion), mavenVersions.plus(mainMavenVersion), closure, false)
}