help: |
    Deploy a system image and kernel to an nfsboot server.
    
    An nfsboot server is defined as a baserock system that has
    tftp and nfs servers running, the tftp server is exporting
    the contents of /srv/nfsboot/tftp/ and the user has sufficient
    permissions to create nfs roots in /srv/nfsboot/nfs/.

    The `location` argument is the hostname of the nfsboot server.

    The extension will connect to root@HOST via ssh to copy the
    kernel and rootfs, and configure the nfs server.