Do not fail build when Coveralls is not available (#606)

Author: kubawerlos

.github/workflows/ci.yaml

@@ -97,7 +97,7 @@ jobs:
  COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  run: |
  composer require --dev php-coveralls/php-coveralls --quiet --with-all-dependencies
- ./vendor/bin/php-coveralls --verbose
+ ./vendor/bin/php-coveralls --verbose || true
 
  - name: Run Infection
  if: steps.coverage-driver.outputs.result != 'none'