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

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

@@ -11,15 +11,21 @@ services:
       JOOMLA_DB_PASSWORD: "{{database_password}}"
       JOOMLA_DB_NAME: "{{database_databasename}}"
     restart: always
+{% if not ( enable_central_database | lower | bool )  %}
     links:
       - database
+{% endif %}
     volumes:
       - data:/var/www/html
     ports:
       - "127.0.0.1:{{http_port}}:80"
 
+{% if not ( enable_central_database | lower | bool )  %}
 {% include 'templates/docker-mariadb-service.yml.j2' %}
+{% endif %}
 
 volumes:
+  data:
+{% if not ( enable_central_database | lower | bool )  %}
   database:
-  data:
+{% endif %}