Add some GitHub workflows to the project

[peterino2]

I suspect that workflows won't be too expensive for this project especially on Linux but several sub tasks would need to be completed in order to make this happen.

• create a docker container with the ability to build the default Linux system with the correct support packages: glfw, lunarg vulkan sdk,
• spin up a GitHub runner on some local hardware which can run some automated testing on a variety of different release builds: ReleaseSafe, ReleaseFast.
• unit testing for all modules which currently have unit tests (p2, papyrus, obj loader).
• automated testing on the main programs (demo, UI sample)

And a goal for much later:

• and a variety of different systems: windows, macos, Ubuntu (oldest still supported lts and latest unstable). Linux builds should just be able to download artifacts from the GitHub actions.