ci: add coverage reporting with Codecov

.github/workflows/codecov-publish.yml

@@ -0,0 +1,37 @@
+name: Deploy CodeCov
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pages: write
+  id-token: write
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install poetry
+        poetry install
+        pip pytest-cov codecov
+    - name: Run tests with coverage
+      run: |
+        poetry run pytest --cov=async_pyserial --cov-report=xml --cov-report=term
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella