Add codecov coverage

.github/workflows/ci-build.yml

@@ -62,3 +62,45 @@ jobs:
         run: tox
         env:
           TOXENV: lint
+
+  coverage:
+    name: Generate coverage
+    runs-on: ubuntu-latest
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+
+      mysql:
+        image: mysql:5.7
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+        ports:
+          - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        # Fetch all tags and branches because tests rely on it
+        with:
+          fetch-depth: 0
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+      - name: Install dependencies and coverage
+        run: python -m pip install tox
+      - name: Test with tox with coverage
+        run: tox
+        env:
+          TOXENV: coverage
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml