Don't fail continuous integration if we cannot publish to Coveralls

Author: glados-verma

.github/workflows/continuous_integration.yml

@@ -56,6 +56,7 @@ jobs:
         python -m pip install tox tox-gh-actions
         tox
     - name: Publish to Coveralls with GitHub Action
+      continue-on-error: true
       uses: coverallsapp/github-action@v2
       with:
         parallel: true