Fix github action paths / parameters

[Ivorforce]

This does several things:

• It actually publishes / fixes the parameters, intended for different folder setups of the project.
• godot-cpp is actually built now, as intended by the action author.
  • I'm not sure if we even need to, given that the latter command builds it fine. But that's for another PR to decide.
• It fixes scons caches, making builds a lot faster (I tested this; repeated builds now fly by very fast).
• It fixes a build error on windows when compiling with doc data.