Pushing a tag in GitLab repository don't trigger the pipeline. Tag Push Events is selected in Webhook.

When you send a commit with [skip ci] in message, the CI is skipped in CircleCI but it don't send back the status to GitLab, so GitLab keeps waiting forever for the end of the pipeline execution and expires by timeout.

Currently I don't see a way to find if a PR is out of base in circle. Is there an orb or an in-build cirlce feature that supports this? Thanks

You should be able to configure GitLab proyects workflows as public for open source