feat(image): add overlay to /etc and use busybox getty for login prompt

image/mkimage.sh

@@ -13,6 +13,7 @@ find rootfs/ -type d -exec chmod 755 {} \;
 ln -sf multi-user.target rootfs/usr/lib/systemd/system/default.target
 
 # mount patos state
+ln -sf ../etc.mount rootfs/usr/lib/systemd/system/local-fs.target.wants/etc.mount
 ln -sf ../var.mount rootfs/usr/lib/systemd/system/sysinit.target.wants/var.mount
 
 # enable dbus
@@ -25,32 +26,6 @@ ln -sf ../systemd-networkd.service rootfs/usr/lib/systemd/system/sysinit.target.
 # generate a temporary machine id
 $systemd/usr/bin/systemd-machine-id-setup --root=rootfs/
 
-# FIXME: remove this later (just to get a shell in the initramfs)
-cat <<EOF > rootfs/usr/lib/systemd/system/demo.service
-[Unit]
-Description=Debug Shell (/bin/sulogin)
-Conflicts=shutdown.target
-Before=shutdown.target
-
-[Service]
-Environment=HOME=/root
-WorkingDirectory=/root
-ExecStart=/bin/sulogin
-Type=idle
-StandardInput=tty-force
-StandardOutput=inherit
-StandardError=inherit
-KillMode=process
-IgnoreSIGPIPE=no
-SendSIGHUP=yes
-Restart=always
-
-[Install]
-WantedBy=multi-user.target
-EOF
-ln -sf ../demo.service rootfs/usr/lib/systemd/system/multi-user.target.wants/demo.service
-
-
 $systemd/usr/bin/ukify build \
   --linux $kernel/bzImage \
   --initrd $initrd/initrd.xz \