ReleaseToGitlab(gitTagName: () -> String, artifactVersion: () -> String, names: Set<String>)
Creates a Gitlab release from an already existing package in the Gitlab maven repository
version - a function that returns the version number that should be released (e.g. 1.2.3)
names - a list of package names (e.g. org/openstreetmap/josm/gradle-josm-plugin)