Fix coverage report

Author: rkoopmans

.github/workflows/ci-cd.yml

@@ -21,7 +21,7 @@ jobs:
         python -m pip install -r requirements_dev.txt
     - name: Test with pytest and coverage
       run: |
-        pytest --rootdir=. --cov=./cert_chain_resolver --cov-report term-missing -n auto tests/
+        pytest --rootdir=. --cov=./cert_chain_resolver --cov-report term-missing  --cov-report=xml:coverage.xml -n auto tests/
     - name: Upload coverage artifact
       if: success()
       uses: actions/upload-artifact@v4