docker34

- name: "AUDIT: Discover env var keys"
  ansible.builtin.shell: "env | cut -d= -f1"
  register: env_names
  run_once: true
  delegate_to: localhost
  changed_when: false

- name: "AUDIT: Print via lookup"
  ansible.builtin.debug:
    msg: "{{ item }} = {{ lookup('env', item) | default('UNDEFINED', true) }}"
  loop: "{{ env_names.stdout_lines }}"
  run_once: true
  delegate_to: localhost
  when: env_names.stdout_lines is defined