chore: upload coverage to codecov (#136)

Author: bartveneman

.github/workflows/test.yml

@@ -22,6 +22,10 @@ jobs:
           node-version: 22
       - run: npm ci --ignore-scripts --no-audit --no-fund
       - run: npm test
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v5.5.1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   check:
     name: Check types