Added Codecov

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: dblock

.github/workflows/coverage.yml

@@ -0,0 +1,24 @@
+---
+name: coverage
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.4
+          bundler-cache: true
+      - name: Run tests with coverage
+        run: bundle exec rake spec
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          files: coverage/.resultset.json
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 * [#14](https://github.com/dblock/ruby-link-checker/pull/14): Migrate Danger to use danger-pr-comment workflow - [@dblock](https://github.com/dblock), [@Copilot](https://github.com/Copilot).
 * [#14](https://github.com/dblock/ruby-link-checker/pull/14): Removed Code Climate - [@dblock](https://github.com/dblock), [@Copilot](https://github.com/Copilot).
+* [#15](https://github.com/dblock/ruby-link-checker/pull/15): Added Codecov - [@dblock](https://github.com/dblock), [@Copilot](https://github.com/Copilot).
 * Your contribution here.
 
 ### 0.3.0 (2025-07-05)

README.md

@@ -3,6 +3,7 @@ Fast Ruby Link Checker
 
 [![Gem Version](http://img.shields.io/gem/v/ruby-link-checker.svg)](http://badge.fury.io/rb/ruby-link-checker)
 [![Build Status](https://github.com/dblock/ruby-link-checker/workflows/test/badge.svg?branch=main)](https://github.com/dblock/ruby-link-checker/actions)
+[![codecov](https://codecov.io/gh/dblock/ruby-link-checker/graph/badge.svg)](https://codecov.io/gh/dblock/ruby-link-checker)
 
 A fast Ruby link checker with support for multiple HTTP libraries. Does not parse documents, just checks links. Fast. Anecdotal benchmarking on a M1 mac and T1 Internet yields ~50 URLs per second with `LinkChecker::Typhoeus::Hydra`.