using correct python version

.gitlab-ci.yml

@@ -45,7 +45,7 @@ test-frontend:
     - apt-get update -qy
     - apt-get install -qy python3-pip
     - pip3 install -r requirements.txt
-    - python manage.py migrate
+    - python3 manage.py migrate
     - gunicorn --pythonpath 'backend/secfit' secfit.wsgi --log-file - &
   script:
     - cd frontend