feat: build prusaslicer from source

[t-pierre]

Thank you very much for your work!

Following the documentation, these changes work only with the latest version of PrusaSlicer 2.9.0.
Not the most elegant, but does the job!

I'll try to make everything dynamic and future-proof for the next release.

Hope it helps

[jamesjnadeau]

I was about to go deep dive into this, but found your work @t-pierre, thanks for doing this!

to anyone following my footsteps, here's what you need to do:

1. Clone t-Pierre's repo locally
2. cd into it and then run docker build -t=prusaslicer-novnc .
3. replace the image you'd normally use here with just prusaslicer-novnc .

[julianneswinoga]

Hey I actually got inspired from this PR to make a new container based on Ubuntu 24.04 and building Prusa Slicer 2.9.4 from source. I did it a bit different than this PR, using shared libraries instead of compiling all the dependencies from source since it speeds up the build a ton. I've also got automatic rebuilds if a new Prusa Slicer version is released. Check it out: https://hub.docker.com/r/julianneswinoga/prusaslicer-web