Awesome it works.
{
 "variables": {
   "repository": "ubuntu",
   "tag": "1.0",
   "root_password": null
 },
 "builders": [{
   "type": "docker",
   "author": "",
   "image": "ubuntu:latest",
   "commit": true,
   "changes": [
    "USER ubuntu"
   ]

  }],
 "provisioners": [
  {
    "type": "shell",
    "inline": [
      "apt-get update -y && apt-get install -y sudo",
      "apt-get dist-upgrade -y && apt-get autoremove -y && apt clean -y && 
apt-get install -y bash-completion curl net-tools iputils-ping git python 
iptables",
      "sleep 15",
      "groupadd -r ubuntu",
      "useradd -r -g ubuntu ubuntu",
      "cd /tmp"
    
     ]

}],

  "post-processors": [
   {
     "type": "docker-tag",
     "repository": "{{user `repository`}}",
     "tag": "{{user `tag`}}"
   },
   {
 "type": "shell-local",
 "inline": ["echo foo"]
 }
 ]
}



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