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

.github/workflows/testing.yml

@@ -2,6 +2,7 @@ name: Testing Django
 on: [ pull_request, push ] # activates the workflow when there is a push or pull request in the repo
 jobs:
   test_project:
+    runs-on: ubuntu-latest # operating system your code will run on
     steps:
       - uses: ./.github/workflows/setup_django.yml
       - name: Run validate_templates