Install ncdu along htop on every system (#2152)

ncdu is one of these small very useful tools, like htop.
It’s a curses UI to recursively dig through the system and
figure out where the disc space is being wasted.

Author: pinaraf

ansible/tasks/setup-system.yml

@@ -17,6 +17,7 @@
           - fail2ban
           - htop
           - linux-libc-dev
+          - ncdu
           - net-tools
           - nftables
           - ngrep