ansible-inventories/arocom#2519 Install wkhtmltopdf when running farm playbook

tasks/main.yml

@@ -7,7 +7,8 @@
 
 - block:
 
-  - import_tasks: install.yml
+  - include_tasks: install.yml
+    when: wkhtmltopdf_install|default(false)
 
   - name: 'Remember that this role had been run'
     set_fact: role_wkhtmltopdf_completed=true