Build fails: missing pages artifacts

I forked pages/pelican to standage/pelican and made a trivial change to trigger a new build. The test task completed successfully but the deploy task failed. Hovering over the failure icon, I get a hover text of "missing pages artifacts", but I get a "No job trace" message when I try to investigate further. See https://gitlab.com/standage/pelican/pipelines/9737919 and https://gitlab.com/standage/pelican/pipelines/9737919/failures.

Please advise.