- set_fact: tmp_dir=/tmp/ansible

- file:
    path: '{{tmp_dir}}'
    state: directory

- name: download file
  get_url:
    dest: &dest '{{tmp_dir}}/dust.deb'
    url: https://github.com/bootandy/dust/releases/download/v{{dust_target_version}}/du-dust_{{dust_target_version}}_amd64.deb

- name: install
  become: yes
  apt:
    deb: *dest