docker: Add support for Fedora

roles/docker/defaults/main.yml

@@ -0,0 +1,3 @@
+---
+docker_osname: >-
+  {% if ansible_distribution == 'Fedora' %}fedora{% else %}centos{% endif %}

roles/docker/tasks/main.yml

@@ -1,7 +1,7 @@
 ---
 - name: Enable repository
   ansible.builtin.get_url:
-    url: https://download.docker.com/linux/centos/docker-ce.repo
+    url: "https://download.docker.com/linux/{{ docker_osname }}/docker-ce.repo"
     dest: /etc/yum.repos.d/docker-ce.repo
     mode: 0644
     owner: root