ci: Fix coverage reporting and update CI badge

This commit resolves issues with the CI workflow related to code coverage reporting.

- Explicitly specifies the coverage configuration file (`--rcfile=.coveragerc`) to ensure correct settings are applied during tests.
- Adds a step to copy the `coverage.xml` report from the Docker container to the host, making it available for the Codecov action.
 - Updates the CI status badge in the README to point to the correct workflow file.

Author: RandomProgramm3r

.github/workflows/ci.yml

@@ -66,7 +66,10 @@ jobs:
       - name: Run tests and generate coverage report 🛡️
         run: >
           docker compose exec -T web sh -c
-          "cd promo_code && coverage run manage.py test && coverage xml"
+          "cd promo_code && coverage run --rcfile=.coveragerc manage.py test && coverage xml"
+        
+      - name: Copy coverage report from container 📂
+        run: docker compose cp web:/app/promo_code/coverage.xml ./coverage.xml
 
       - name: Upload coverage to Codecov 🚀
         uses: codecov/codecov-action@v5

README.md

@@ -1,6 +1,6 @@
 # Promo Code API
 
-[![CI/CD](https://github.com/RandomProgramm3r/Promo-Code-API/actions/workflows/linting.yml/badge.svg)](https://github.com/RandomProgramm3r/Promo-Code-API/actions)
+[![CI/CD](https://github.com/RandomProgramm3r/Promo-Code-API/actions/workflows/ci.yml/badge.svg)](https://github.com/RandomProgramm3r/Promo-Code-API/actions)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 [![codecov](https://codecov.io/github/RandomProgramm3r/Promo-Code-API/graph/badge.svg?token=VNBK0FAU3Z)](https://codecov.io/github/RandomProgramm3r/Promo-Code-API)