If you would like to use Phan for Gitlab CI and the Code Quality Widget, the current JSON Printer falls short since it does not:

1. Provide a fingerprint key for each problem detected
2. Map the Phan severity rating into a known Gitlab severity rating.

I have already created a new Gitlab Issue printer for Phan and would like to upstream it to this project, to simplify the steps in the CI job.

I am also happy to maintain this specific printer if there are any issues that arise.

I'll also provide a code sample of how to use Phan in the CI Job in the docs.

References

https://docs.gitlab.com/ee/ci/testing/code_quality.html#implement-a-custom-tool