Notify coverage

[erseco]

This pull request enhances the CI workflow to include code coverage reporting and badge updates, making it easier to track and visualize test coverage directly from the repository. The main improvements involve generating coverage reports, extracting and displaying coverage metrics, uploading artifacts, and updating a dynamic coverage badge. Additionally, the README.md now displays the CI and coverage badges for better project visibility.

CI workflow improvements:

• Added steps to start the environment with Xdebug for coverage, run tests with coverage, extract coverage percentage, and display coverage metrics in the job summary. (.github/workflows/ci.yml)
• Uploaded the coverage report as a workflow artifact for easier access and historical retention. (.github/workflows/ci.yml)

Coverage badge automation:

• Automatically updates a dynamic coverage badge in a GitHub Gist when changes are pushed to the main branch, reflecting the latest coverage percentage and color. (.github/workflows/ci.yml)

Documentation and visibility:

• Added CI and coverage badges to the top of the README.md to provide instant feedback on build status and code coverage. (README.md)

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