fixup! refactor(ci): split django setup into reusable workflow

.github/workflows/testing.yml

@@ -4,6 +4,7 @@ jobs:
   test_project:
     runs-on: ubuntu-latest # operating system your code will run on
     steps:
+      - uses: actions/checkout@v2
       - uses: ./.github/workflows/setup_django.yml
       - name: Run validate_templates
         run: |