feat(git): add coveralls to track repo coverage (#7)

This pull request updates the CI workflow to enhance testing and code
coverage reporting. The most important changes involve adding the
`xdebug` extension, generating code coverage during tests, and uploading
the coverage report to Coveralls.

### CI workflow improvements:

*
[`.github/workflows/ci.yml`](diffhunk://#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR220-R229):
Added the `xdebug` extension to the PHP setup to enable code coverage
generation.
*
[`.github/workflows/ci.yml`](diffhunk://#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR220-R229):
Updated the test step to generate code coverage using PHPUnit.
*
[`.github/workflows/ci.yml`](diffhunk://#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR220-R229):
Added a new step to upload the generated code coverage report to
Coveralls using the Coveralls GitHub Action.

Author: mubbi

.github/workflows/ci.yml

@@ -217,7 +217,13 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: '8.3'
+          extensions: xdebug
       - name: Install dependencies
         run: composer install --prefer-dist --no-progress
-      - name: Run tests
-        run: vendor/bin/phpunit || echo "No tests found"
+      - name: Run tests and generate code coverage
+        run: vendor/bin/phpunit || echo "No tests found"
+      - name: Upload coverage to Coveralls
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: coverage/coverage.xml