ci: add coverage workflow

.github/workflows/coverage.yml

@@ -0,0 +1,25 @@
+on:
+  push:
+    paths-ignore:
+      - '*.md'
+  pull_request:
+
+env:
+  CI: true
+  NODE_ENV: cov
+
+jobs
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v4
+      - run: npm install
+      - name: run coverage
+        run: npx -y c8 --reporter=lcov npm test
+      - name: codecov
+        uses: codecov/codecov-action@v2
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}