fix wsgi.py;

added entrypoint.sh as django entrypoint;
install and use gunicorn as prod server;

backend/scripts/entrypoint.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+# executes the manage.py commands to setup and starts the server
+
+echo "setup"
+python manage.py makemigrations
+python manage.py makemigrations app_be
+python manage.py migrate
+
+echo "run server"
+gunicorn app_be.wsgi:application -b 0.0.0.0 -p 8000