test(unit): modernize coverage collection

Author: travi

.c8rc.json

@@ -0,0 +1,2 @@
+comment:
+  layout: reach,diff,flags,tree

.codecov.yml

@@ -46,7 +46,12 @@ jobs:
       - run: npm clean-install
       - run: corepack npm audit signatures
       - run: npm test
-      - uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
+      - name: Upload unit test coverage to Codecov
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          flags: unit
+          report_type: coverage
   release:
     needs:
       - verify

.github/workflows/node-ci.yml

@@ -133,7 +133,7 @@ $ npm test
 
 [coverage-link]: https://codecov.io/github/form8ion/github-actions-node-ci
 
-[coverage-badge]: https://img.shields.io/codecov/c/github/form8ion/github-actions-node-ci?logo=codecov
+[coverage-badge]: https://img.shields.io/codecov/c/github/form8ion/github-actions-node-ci/master?logo=codecov
 
 [slsa-badge]: https://slsa.dev/images/gh-badge-level2.svg