Setup reports and upload codecov

Create coverage.xml, upload it to GitHub CI and visualize with codecov.

Setup instruction:
- Install codecov for project
  https://github.com/settings/installations/55029514
- Add CODECOV_TOKEN in the GitHub CI project secrets

Related #1097

.github/workflows/tests.yml

@@ -31,6 +31,16 @@ jobs:
       run: |
         make test
 
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v4.5.0
+      with:
+        directory: ./coverage/reports/
+        env_vars: OS, PYTHON
+        files: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+        token: ${{ secrets.CODECOV_TOKEN }}
+
   macos-tests:
     runs-on: macos-latest
 
@@ -55,4 +65,13 @@ jobs:
         make install_pip PIP_ARGS='.["test"]'
     - name: Run tests on macOS
       run: |
-        export DYLD_LIBRARY_PATH=$(brew --prefix hidapi)/lib:$DYLD_LIBRARY_PATH && pytest --cov
+        export DYLD_LIBRARY_PATH=$(brew --prefix hidapi)/lib:$DYLD_LIBRARY_PATH && pytest --cov --cov-report=xml
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v4.5.0
+      with:
+        directory: ./coverage/reports/
+        env_vars: OS, PYTHON
+        files: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+        token: ${{ secrets.CODECOV_TOKEN }}

Makefile

@@ -66,4 +66,4 @@ lint:
 
 test:
 	@echo "Running Solaar tests"
-	pytest --cov
+	pytest --cov --cov-report=xml