Add OS specific variable overrides.

Specifically Alpine official repo uses `docker` rather than `docker-ce` or `docker-ee`

tasks/main.yml

@@ -1,4 +1,14 @@
 ---
+- name: Load OS specific package information
+  include_vars: "{{ lookup('first_found', params) }}"
+  vars:
+    params:
+      files:
+        - '{{ansible_distribution}}.yml'
+        - '{{ansible_os_family}}.yml'
+        - default.yml
+      paths:
+        - 'vars'
 - include_tasks: setup-RedHat.yml
   when: ansible_os_family == 'RedHat'
 

vars/Alpine.yml

@@ -0,0 +1,2 @@
+---
+docker_package: "docker"

vars/default.yml

@@ -0,0 +1,2 @@
+---
+# Empty file