Reverse order of variable inclusions so specific vars can override generics.

tasks/main.yml

@@ -1,12 +1,5 @@
 ---
 # Variable setup.
-- name: Include distribution and version-specific vars.
-  include_vars: "{{ item }}"
-  with_first_found:
-    - files:
-        - "{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
-      skip: true
-
 - name: Set the default PHP version for Debian-based OSes.
   set_fact:
     php_default_version_debian: "{{ __php_default_version_debian }}"
@@ -15,6 +8,13 @@
 - name: Include OS-specific variables.
   include_vars: "{{ ansible_os_family }}.yml"
 
+- name: Include distribution and version-specific vars.
+  include_vars: "{{ item }}"
+  with_first_found:
+    - files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_major_version }}.yml"
+      skip: true
+
 - name: Define php_packages.
   set_fact:
     php_packages: "{{ __php_packages | list }}"