Specify where Jenkins would store job workspaces on the master node.
    (It has no effect on builds run on slaves.)
    This value can include the following variables.
    
        - ${JENKINS_HOME} — Jenkins home directory.
        
- ${ITEM_ROOTDIR} — Root directory of a job for which the default workspace is allocated.
        
- ${ITEM_FULL_NAME} — '/'-separated job name, like "foo/bar".
    
    Changing this value allows you to put workspaces on SSD, SCSI, or even ram disks.
    Default value is ${ITEM_ROOTDIR}/workspace.