Send coveralls report only if coverage enabled for job

Author: andrew-demb

.github/workflows/continuous_integration.yml

@@ -83,5 +83,6 @@ jobs:
 
       - name: Upload coverage results to Coveralls
         run: php-coveralls --coverage_clover=coverage.xml -v
+        if: ${{ matrix.coverage }}
         env:
           COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}