chore(ci): run all tests in workflow

Author: denizozgur

.github/workflows/ci.yml

@@ -28,4 +28,7 @@ jobs:
       - name: Run tests
         run: |
           source venv/bin/activate
-          python backend/manage.py test
+          python backend/manage.py test outcomes
+          python backend/manage.py test users
+          python backend/manage.py test giraph
+          python backend/manage.py test programs