Building docker images using packer and ansible

packer.json

{
  "variables": {
    "host": "default",
  },
  "builders": [
    {
      "type": "docker",
      "image": "debian:9.6",
      "commit": true,
      "run_command": [
        "-d",
        "-i",
        "-t",
        "--name",
        "{{user `host`}}",
        "{{.Image}}",
        "/bin/bash"
      ]
    }
  ],
  "provisioners": [
    {
      "type": "ansible",
      "user": "root",
      "playbook_file": "./playbook.yml",
      "extra_arguments": [
        "--extra-vars",
        "ansible_host={{user `host`}} ansible_connection=docker"
      ]
    }
  ]
}

playbook.yml

- hosts: all
  tasks:
  - name: "install python"
    raw: "apt-get update && apt-get install -yq python"

  - name: "install netcat"
    apt:
      state: present
      update_cache: true
      name:
      - "netcat"

  - name: "remove apt content"
    file: 
      state: absent
      path: "/var/lib/apt/lists/"

  - name: "remove python"
    apt:
      autoremove: true
      purge: true
      name:
      - python