Add back coverage tracking

Author: lukasmasuch

.github/workflows/node.js.yml

@@ -20,6 +20,12 @@ jobs:
             - run: npm run test-source
             - run: npm run test-cells
             - run: npm run test-projects
+            - name: Coveralls
+              uses: coverallsapp/github-action@master
+              with:
+                  github-token: ${{ secrets.GITHUB_TOKEN }}
+                  path-to-lcov: ./packages/core/coverage/lcov.info
+                  base-path: ./packages/core
     test-react-18:
         runs-on: ubuntu-latest
         steps: