added superuser support in apps.lyric.admin & new manage.py cmd ensure_superuser; .tests.integrated.test_admin & .test_management_commands green

infra/deploy.sh.j2

@@ -30,6 +30,9 @@ docker run -d --name gamearray_celery \
 echo "==> Running migrations..."
 docker exec gamearray python ./manage.py migrate
 
+echo "==> Ensuring superuser exists..."
+docker exec gamearray python manage.py ensure_superuser
+
 echo "==> Copying static files..."
 sudo docker cp gamearray:/src/static/. /var/www/gamearray/static/