no valid tests found - v 0.9.0

[nschcolnicov]

When running an nf-test on github CI, I see that the test runs, but then it crashes raising the error "no valid tests found". When running the same command on the cloned repo it runs through without any issues.

Error log:

Running in the cloned repo:

PR where the issue is happening: https://github.com/nf-core/demultiplex/pull/253