feat: upload coverage to codecov

.github/workflows/coverage.yml

@@ -0,0 +1,32 @@
+name: Coverage
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  upload:
+    name: Upload
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run test coverage
+        run: npm run test:coverage
+
+      - name: Upload code coverage to codecov.io
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          directory: ./coverage
+          flags: unittests
+          fail_ci_if_error: true