Define a list of files and subdirectories that must be staged by the workflow platform prior to executing the command line tool.
Normally files are staged within the designated output directory. However, when running inside containers, files may be staged at arbitrary locations, see discussion for [`Dirent.entryname`](#Dirent). Together with `DockerRequirement.dockerOutputDirectory` it is possible to control the locations of both input and output files when running in containers.
