Added draft for central postgres and mariadb. variables and networks still need to be adapted

roles/docker-mailu/tasks/main.yml

@@ -28,6 +28,11 @@
     state: directory
     mode: 0755
 
+- name: create database in central MariaDB
+  include_role:
+    name: docker-mariadb
+  when: enable_central_database | bool
+
 - name: add docker-compose.yml
   template: 
     src:  "docker-compose.yml.j2"