Fix 'one liner' in docker-entrypoint.sh

docker-entrypoint.sh

@@ -25,12 +25,11 @@ python manage.py migrate
 # Check for first install
 if [ ! -f status.created ]; then
   # Create the default admin user
-  echo "[+] Create the default admin user"
-#  echo "\
-#from django.contrib.auth import get_user_model; \
-#User = get_user_model(); \
-#User.objects.create_superuser('admin', 'admin@dev.patrowl.io', 'Bonjour1!') if User.objects.count() == 0 else pass" | python manage.py shell
-  echo "from django.contrib.auth import get_user_model; User = get_user_model(); User.objects.create_superuser('admin', 'admin@dev.patrowl.io', 'Bonjour1!')" | python manage.py shell
+  echo "[+] Create the default admin user (if needeed)"
+  # Be careful with Python identation and echo command
+  echo -e "from django.contrib.auth import get_user_model\r\
+User = get_user_model()\r\
+if not User.objects.filter(username='admin').exists(): User.objects.create_superuser('admin', 'admin@dev.patrowl.io', 'Bonjour1!')" | python manage.py shell
 
   # Populate the db with default data
   echo "[+] Populate the db with default data"