fix: specify correct shell path (#159)

PR Close #159

Author: Mikhail Eremeev

app/docker-entrypoint.sh

@@ -1,6 +1,6 @@
-#!/usr/bin/env bash
+#!/bin/bash
 python manage.py migrate --no-input
 python manage.py collectstatic --no-input
 python manage.py createsu
 
-exec "$@"
+exec "$@"