Don't use migrate in setup-database routine.

docker-entrypoint.sh

@@ -7,7 +7,6 @@ else
   if [[ $1 == "--setup-database" ]]
   then
     venv/bin/python -m flask db init
-    venv/bin/python -m flask db migrate -m "initial migration"
     venv/bin/python -m flask db upgrade
     venv/bin/python -m flask insert-initial-database-entries
   fi