cern-root-setup/roles/cern-root-install/tasks/01_fedora.yaml

---
- name: "Download Fedora 31 package"
  get_url:
    url: "{{ fedora31_url }}"
    dest: "{{ root_package }}"
  when:
    - ansible_distribution_version ==  "31"

- name: "Download Fedora 30 package"
  get_url:
    url: "{{ fedora30_url }}"
    dest: "{{ root_package }}"
  when:
    - ansible_distribution_version ==  "30"

...