group_vars, redhat.yml

---
os_repos:
  - name: epel
    gpgcheck: yes
    baseurl: https://wibble.com/repos/epel/x86_64
    gpgkey: http://wibbl.com/repos/RPM-GPG-KEY

repos.yml

---
# tasks only, no other funny business
- name: group by OS Type
  group_by:
    key: "{{ ansible_os_family|lower }}"
    
- name: add yum repos
  yum_repo:
    name: "{{ item.name }}"
    gpgcheck: "{{ item.gpgcheck|default(True) }}"
    baseurl: "{{ item.baseurl }}"
    gpgkey: "{{ item.gpgkey }}"
  with_items: "{{ os_repos }}"