---
- name: Add apt key for node repo
  apt_key:
    url: https://keyserver.ubuntu.com/pks/lookup?op=get&fingerprint=on&search=0x1655A0AB68576280
    id: "68576280"
    state: present

- name: Add repo
  apt_repository:
    repo: "deb [arch=amd64,i386] https://deb.nodesource.com/node_8.x {{ ansible_distribution_release }} main"
    state: present
  register: node_repo

- name: Install nodejs 8.x
  apt:
    name: nodejs
    state: present
    update_cache: yes
    force: yes
...