fix volumes in compose file

templates/services/droneci-compose.yml.j2

@@ -8,13 +8,13 @@ services:
 
     ports:
       - {{ droneci_server_exposed_ip + ':' if droneci_server_exposed_ip is defined else '' }}{{ droneci_server_exposed_port }}:80
-    {% if not droneci_postgres_enabled %}
     volumes:
+      {% if not droneci_postgres_enabled %}
       - droneserver-data:/var/lib/drone/
+      {% endif %}
       {% if droneci_license_key is defined %}
       - {{ droneci_license_key }}:/etc/drone.key
       {% endif %}
-    {% endif %}
     {% if droneci_server_extra_hosts | default([]) %}
     extra_hosts:
     {% for host in droneci_server_extra_hosts %}