fix(ci): Change directory before running coverage

This commit updates the `ci.yml` workflow to change into the `promo_code` directory before executing the `coverage run` command.

Author: RandomProgramm3r

.github/workflows/ci.yml

@@ -65,7 +65,7 @@ jobs:
       - name: Run tests and generate coverage report 🛡️
         run: >
           docker compose exec -T web sh -c
-          "coverage run manage.py test && coverage xml"
+          "cd promo_code && coverage run manage.py test && coverage xml"
 
       - name: Upload coverage to Codecov 🚀
         uses: codecov/codecov-action@v5