Resolve "Docker image: Postgres not ready when trying to connect"

deploy.sh

 #!/bin/sh
-sleep 1
+sleep 5
 python manage.py migrate --noinput
+if [ "$?" -ne "0" ]; then
+  exit 1
+fi
 gunicorn \
   --bind 0.0.0.0:8000 \
   --workers=5 \