cloud-init for C-CNC-ready virtual machines

cloud-init.yml

#cloud-config
users:
  - default
  - name: ccnc
    gecos: C-CNC User
    groups: sudo
    shell: /bin/bash
    sudo: ALL=(ALL) NOPASSWD:ALL
    passwd: $6$rounds=4096$zHeUceWF8g9fEz1H$6bMoNJcKX4bt9rcYIHKEG2TjoLCHRMDwYsz98NEI3N7UgexTNv2XhMvvc4qrnky.ScBpSe68WDoP0FXXHJRTL.

write_files:
  - path: /tmp/hello.txt
    content: 'Funziona!'
    owner: root:root
    encoding: text/plain
    append: false
    defer: false
  
packages:
  - build-essential 
  - make 
  - cmake 
  - cmake-curses-gui 
  - clang 
  - clang-format 
  - lldb 
  - libgsl-dev 
  - ruby 
  - figlet 
  - sshfs 
  - graphviz 
  - gnuplot
  - libmosquitto-dev

runcmd:
  - [gem, install, gv_fsm]
  - [update-alternatives, --set, c++, /usr/bin/clang++]
  - [update-alternatives, --set, cc, /usr/bin/clang]