Make and publish build

[antoinecharruel]

This PR modifies the existing GitHub Actions workflow to automatically create a GitHub release and publish it to the Godot Asset Library.

• Uses softprops/action-gh-release@v2 for release.
• Uses deep-entertainment/godot-asset-lib-action@v0.4.0 for publishing.

[dsnopek]

Thanks!

However, I'm not sure this makes sense as part of this template. Not everyone is making a GDExtension for the purpose of distributing on the Godot asset library. I suppose this template already sort of leans that way, in that it calls the project directory "demo", so perhaps users are already mostly doing that?

I guess we need to clarify for ourselves who the audience of this template is: Is it everyone using GDExtension (which includes making a GDExtension which is just the game logic for your specific game)? Or, is it folks making reusable GDExtensions that they intend to distribute on the asset library?

[antoinecharruel]

Thanks for the feedback.

In case this is useful in the future, I’ve added a commit that makes the GitHub release and Asset Library publication optional.

Thanks