files: The files and/or folders to be included in the zip file. Folders will be included recursively.
rootFolder: The root folder. All files will be stored with relative paths relative to this folder.
compressionLevel: A number between 1 and 9. 9 compresses best, but it also takes the longest.
Details
Uses Java's compression library to create a zip file. It is similar to utils::zip, except that it does not require an external zip tool to be available on the system path.