Modify V-Sekai game to build using world-editor

[fire]

Describe the proposed feature and how it helps to overcome a problem or limitation

We do not have built versions of v-sekai.

Other information about your context or usecase.

We need built versions of v-sekai.

If known, describe how your proposal will work, with code, pseudo-code, mock-ups, or diagrams

Update the just file to fetch the artifacts from the world editor. Then, do a godot engine build and export the results as artifacts.

Anything else

No response