Allow enabling ssh server from config

Add ENABLE_SSH option

stage2/01-sys-tweaks/01-run.sh

@@ -15,7 +15,11 @@ on_chroot << EOF
 systemctl disable hwclock.sh
 systemctl disable nfs-common
 systemctl disable rpcbind
-systemctl disable ssh
+if [ "${ENABLE_SSH}" == "1" ]; then
+	systemctl enable ssh
+else
+	systemctl disable ssh
+fi
 systemctl enable regenerate_ssh_host_keys
 EOF