installer: copy 1M zeroes to the target device before running fdisk
installer: copy 1M zeroes to the target device before running fdisk

otherwise grub-install chokes, even after the new partition table has been created

luxas/os,luxas/os,juliengk/os,maxfierke/rancher-os,SvenDowideit/os,rancherio/os,datawolf/os,maxfierke/rancher-os,imikushin/os,juliengk/os,rancherio/os,maxfierke/rancher-os,rancher/os,imikushin/os,datawolf/os,rancher/os,luxas/os,datawolf/os,ibuildthecloud/os,gizmotronic/os,rancherio/os,gizmotronic/os,SvenDowideit/os,ibuildthecloud/os