fix: Convert Line Endings from CRLF to LF

entrypoint.sh

@@ -1,8 +1,13 @@
-#!/bin/sh
+#!/bin/bash
 
 python manage.py migrate
 
-echo "from django.contrib.auth import get_user_model; User = get_user_model(); User.objects.create_superuser('admin', '[email protected]', 'password_secret')" | python manage.py shell
+echo "
+from django.contrib.auth import get_user_model
+User = get_user_model()
+if not User.objects.filter(username='admin').exists():
+    User.objects.create_superuser('admin', '[email protected]', 'password_secret')
+" | python manage.py shell
 
 python manage.py collectstatic --no-input