solution

apache.yml

@@ -9,6 +9,9 @@
 
   tasks:
 
+  - name: import OS variables
+    include_vars: "{{ ansible_distribution | lower }}.yml"
+
   - name: install apache
     package:
       name: "{{ apache_package_name }}"
@@ -20,7 +23,7 @@
       dest: "{{ apache_config_dir}}/vhost.conf"
       mode: 0640
       owner: root
-      group: apache
+      group: "{{ apache_group_name }}"
     notify: restart apache
 
   - name: activate apache