add volume for patchpanel

Dockerfile

@@ -29,6 +29,8 @@ RUN rm -rf /var/www/html/*
 ADD . /var/www/html
 RUN chown -R ${APACHE_RUN_USER} /var/www/html
 
+VOLUME /var/www/html/patchpanel/data
+
 USER ${APACHE_RUN_USER}
 
 EXPOSE 80