overwrite default nginx conf with xos site config
diff --git a/xos/configurations/opencloud/Dockerfile b/xos/configurations/opencloud/Dockerfile
index 51eeba3..5a4db61 100644
--- a/xos/configurations/opencloud/Dockerfile
+++ b/xos/configurations/opencloud/Dockerfile
@@ -132,7 +132,7 @@
 RUN bash /opt/xos/tosca/install_tosca.sh
 
 # configure nginx
-RUN cp /opt/xos/nginx/xos.conf /etc/nginx/sites-enabled/
+RUN cp /opt/xos/nginx/xos.conf /etc/nginx/sites-enabled/default
 
 # Supervisor configuration
 RUN cp /opt/xos/configurations/opencloud/supervisord.conf  /etc/supervisor/conf.d/xos-all.conf