Use /root as current working directory in init-minimal

When booting via systemd, ssh and the serial bash have /root as cwd. To
make the behavior of further commands more consistent, cd there when
using the minimal init. This avoids having SSH commands do slightly
different things depending on the init system.

tasks.sh

@@ -238,6 +238,10 @@ cat /etc/hostname > /proc/sys/kernel/hostname
 ip link set eth0 up
 dhclient eth0
 
+# Change cwd to /root
+HOME=/root
+cd $HOME
+
 # Start the SSH server
 mkdir /run/sshd/
 /usr/sbin/sshd