feat: add codecov to Github workflow

Author: Charles Larivier

.github/workflows/python-package.yml

@@ -19,19 +19,31 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
     - uses: actions/checkout@v2
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install pipenv
-        pipenv install --deploy
+        pipenv install --deploy --dev
+
     - name: Test with pytest
       run: |
-        pipenv run pytest
+        pipenv run pytest --cov=./ --cov-report=xml
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        directory: ./coverage/reports/
+        env_vars: OS,PYTHON
+        fail_ci_if_error: true