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

roles/docker-akaunting/templates/docker-compose.yml.j2

@@ -14,11 +14,15 @@ services:
       - env/run.env
     environment:
       - AKAUNTING_SETUP
+{% if not ( enable_central_database | lower | bool )  %}
     depends_on:
       - database
 
 {% include 'templates/docker-mariadb-service.yml.j2' %}
+{% endif %}
 
 volumes:
   data:
-  database:
+{% if not ( enable_central_database | lower | bool )  %}
+  database:
+{% endif %}