further debugging

wait_for_container.sh

 #!/bin/sh
 while [ -z $(docker exec -i $(docker ps -qf "name=emg-pvs_registrar") python3 /var/www/pvs/dev/pvs_instance/manage.py id list) ]; do
   >&2 echo "Collection is not created yet - sleeping"
-    tail  /var/log/messages
+    docker ps --no-trunc emg-pvs_registrar
     docker service ls
+    docker images
     sleep 20
   done