Improve pdfalto versioning

[lfoppiano]

With proper release cycle

[AaronNGray]

@lfoppiano We need to keep up with any changes with a realtime updated master devel SNAPSHOT release to be used by a realtime Grobid SHAPSHOT release. Then when SNAPSHOT's are tested and stable we can spawn off a majot or minor version release. Whether we do periodic patch level releases as well is another question.

[AaronNGray]

@lfoppiano - I have added versioning environment variables in ci-build-libs.yml for the different libraries :-

AaronNGray@5aaa3e1

In this branch :-

https://github.com/AaronNGray/pdfalto/tree/feature/version-environment-variables

[lfoppiano]

Super! Could you please create a PR (tick "allow maintainer to write/access") so that I can see and eventually iterate over this change?

[AaronNGray]

Done. Its only the 4 library version variables I have lifted.

I am currently working on an upload_assets GitHub Action that deals with multiple files nicely as all the existing ones dont work nicely and seem to have stale Node.js code.