fix exit if migrate fails

Author: zeylos

src/backend/entrypoint

@@ -34,7 +34,7 @@ fi
 # This _HAS_ to be "true" on a single backend instance
 if [ "${ENABLE_DB_MIGRATIONS:-false}" = "true" ]; then
   echo "🐳(entrypoint) running django migrations..."
-  python manage.py migrate --noinput
+  python manage.py migrate --noinput || exit 1
 fi
 
 echo "🐳(entrypoint) running your command: ${*}"