Fails in CI

[koppor]

https://github.com/dante-ev/docker-texlive/actions/runs/13296470057/job/37129473809?pr=55

docker run -v $(pwd):/workdir localhost:5000/name/app:latest lualatex --shell-escape minimal-plantuml.tex

lualatex: Not writing to /workdir/minimal-plantuml0-plantuml.txt (openout_any = p; no  extended check).

I remember, there was a PR with relativizing filenames. Maybe, this does not work in all cases? (#42)