fix: correct coverage file handling in CI workflow

- Update Docker volume mount point from /coverage to /app
- Specify exact coverage.xml output path in pytest command
- Remove unnecessary cp command as coverage file is now generated directly in mounted volume

.github/workflows/python-tests.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Build and run tests in Docker
       run: |
         docker build -t tweakslite-tests .
-        docker run --rm -v ${PWD}:/coverage tweakslite-tests cp coverage.xml /coverage/
+        docker run --rm -v ${PWD}:/app tweakslite-tests
 
     - name: Upload coverage
       uses: codecov/codecov-action@v4

Dockerfile

@@ -45,4 +45,4 @@ RUN /root/.cargo/bin/uv pip install pygobject && \
     /root/.cargo/bin/uv pip install -r tests/requirements-test.txt
 
 # Command to run tests
-CMD ["dbus-run-session", "--", "pytest", "tests/", "--cov=tweakslite", "--cov-report=xml"]
+CMD ["dbus-run-session", "--", "pytest", "tests/", "--cov=tweakslite", "--cov-report=xml:./coverage.xml"]