How do I create a tar file from selected files from different directories?

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2

I’ve added this task, but it doesn’t create anything. The variable files is an ArrayList of file names, and they exist.

task tgzTask(type: Tar) {
   include files
 baseName = 'test'
 destinationDir = file('.')
 extension = 'tgz'
 compression = Compression.GZIP
}
  println tgzTask.archiveName
println relativePath(tgzTask.destinationDir)
println relativePath(tgzTask.archivePath)
println files.size
files.each {println it}