ci: codecov report upload

Author: DamianOsipiuk

.github/workflows/ci.yml

@@ -37,6 +37,10 @@ jobs:
       - run: npm test
         env:
           CI: true
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   publish:
     # publish only when merged in master on original repo, not on PR