Upload code coverage to coveralls

[remdub]

plone.meta initially supported uploading code coverage reports to Coveralls.
Before shared workflows were introduced, there were references to Coveralls here.

We could reintroduce this optional feature in two different ways:

• In tox.ini, by adding Coveralls to [testenv:coverage]
• In the composite action .github/workflows/coverage.yml, by adding a flag and a step to upload the coverage report

I think the second option is cleaner, since we generally only want to upload coverage reports when code is pushed.

What do you think? I’d be happy to open a pull request if there’s interest in bringing this back.

[gforcada]

Sounds good if optional and only on GitHub Actions 👍🏾

will this work on GitLab CI as well? 🤔

Lastly, coverage itself can generate reports, are there any GHA that might be used instead of having to rely on an external tool (like Coveralls)?

For internal projects that can not use external tools for whatever reason, that would be a nice alternative.

[remdub]

will this work on GitLab CI as well? 🤔

To make this work with Gitlab CI, we should also modify gitlab-ci.yml.j2 .
We don't host any Plone project on GitLab so I haven't tested yet, but it's officially supported with Coveralls Universal Reporter. It should not be that hard to do.

Lastly, coverage itself can generate reports, are there any GHA that might be used instead of having to rely on an external tool (like Coveralls)?

There is indeed an officially supported Github composite action for this. ( https://docs.coveralls.io/ci-services )
Here is a working example with actual meta coverage.yml workflow :
remdub@308148f