I am sorry. I was under the impression that, at least for some features, Stirling PDF also uses pdfjam or similar, instead of wholly delegating to PDFBox. I think the point still stands, that there are powerful cli tools and I wouldn't consider running this container just for myself.

Probably anybody who can get this docker container running, can use appropiate open source cli tools. So one would wonder about the target audience. I don't. ;)

But I do indeed LibreOffice's command line conversion features.