Don't fail continuous integration if we cannot publish to Coveralls (google#1273)

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

* Continue on Coveralls error in the "finish" action also

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
@@ -78,6 +79,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Coveralls Finished
+      continue-on-error: true
       uses: coverallsapp/github-action@v2
       with:
         parallel-finished: true