How to get coverage for a PR from a “foreign” fork with GitHub Actions

I am trying for about a week or two to get code coverage reports for a PR from a fork, where the submitter/forker is not part of the team of the original repository

For members of this repository code coverage just works fine.

So: Using GitHub Actions how can any foreigner opening a PR get code coverage reports?

Hi @kellertuer, I noticed this comment on the PR https://github.com/JuliaManifolds/Manifolds.jl/pull/185#issuecomment-632721609, has this been resolved?