[#163] Explicitly add pytest

Signed-off-by: delano <[email protected]>

.github/workflows/django.yml

@@ -134,13 +134,12 @@ jobs:
       #----------------------------------------------
       - name: Install django ${{ matrix.django-version }}
         run: |
-          source .venv/bin/activate
           poetry add Django@${{ matrix.django-version }}
 
       #--------------------------------------------
       # run tests
       #--------------------------------------------
       - name: Run tests
         run: |
-          source .venv/bin/activate
+          poetry add pytest
           poetry run pytest