add coverage badge to readme

README.md

@@ -1,6 +1,6 @@
 # deploy-pages 🚀
 
-[![Check distributables](https://github.com/actions/deploy-pages/actions/workflows/check-dist.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/check-dist.yml) [![Check linter](https://github.com/actions/deploy-pages/actions/workflows/check-linter.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/check-linter.yml) [![Checking formatting](https://github.com/actions/deploy-pages/actions/workflows/check-formatting.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/check-formatting.yml) [![Run Tests](https://github.com/actions/deploy-pages/actions/workflows/test.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/test.yml) [![CodeQL](https://github.com/actions/deploy-pages/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/codeql-analysis.yml)
+[![Check distributables](https://github.com/actions/deploy-pages/actions/workflows/check-dist.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/check-dist.yml) [![Check linter](https://github.com/actions/deploy-pages/actions/workflows/check-linter.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/check-linter.yml) [![Checking formatting](https://github.com/actions/deploy-pages/actions/workflows/check-formatting.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/check-formatting.yml) [![Run Tests](https://github.com/actions/deploy-pages/actions/workflows/test.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/test.yml) [![CodeQL](https://github.com/actions/deploy-pages/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/actions/deploy-pages/actions/workflows/codeql-analysis.yml) [![coverage](./badges/coverage.svg)](./badges/coverage.svg)
 
 This action is used to deploy [Actions artifacts][artifacts] to GitHub Pages.