ansible-role-nginx/tasks/keys/apt-key.yml

---
- name: "(Install: APT OSs) Set Default APT NGINX Signing Key URL"
  set_fact:
    default_keysite: >-
      {{ (ansible_distribution_release == 'trusty')
      | ternary('http://nginx.org/keys/nginx_signing.key', 'https://nginx.org/keys/nginx_signing.key') }}

- name: "(Install: APT OSs) Set APT NGINX Signing Key URL"
  set_fact:
    keysite: "{{ nginx_signing_key | default(default_keysite) }}"

- name: "(Install: APT OSs) Add APT NGINX Signing Key"
  apt_key:
    url: "{{ keysite }}"