Use containerized dell-idrac-adm in order to mount an iso on remote fileserver (http), and reboot the server from it.
Usage:
docker build -t idrac-racadm .
docker run --net=host idrac-racadm -r assisted-lab-3.mgmt.upshift.eng.rdu2.redhat.com -u -p -i http://kvm-01-guest18.lab.eng.rdu2.redhat.com/files/installer-image.iso