ci: add coverage reporter

Author: rolandjitsu

.github/workflows/test.yml

@@ -23,3 +23,12 @@ jobs:
         run: npm ci
       - name: Test
         run: npm test
+
+  coverage:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: coverallsapp/[email protected]
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          parallel-finished: true