Add black to CI but allow to fail

This is so this branch can be reviewed in isolation and the next
PR contains all the changes with the formatter and requires it in CI.

.github/workflows/continous-integration.yml

@@ -91,6 +91,9 @@ jobs:
           python network-api/manage.py compilemessages
       - name: Run linting
         run: flake8 tasks.py network-api/
+      - name: Run format check
+        run: black . --check
+        continue-on-error: true
       - name: Run type checks
         run: mypy network-api
       - name: Run Tests