feat: Build specific platform binary via GitHub Actions

[boscohyun]

Background

This Unity project was already associated with a project that we manage in the Unity console in Planetarium, but now we're actively using Unity Purchase.
So when we build this Unity project, if we don't have member permissions to the project in the Unity console, we'll build a binary that doesn't work with some features.

Needs

I want people who are not registered as members of the Unity Console project on Planetarium to be able to build binaries for specific platforms.

How to

When someone requests a GitHub action to build a binary for a specific platform, an authorized GitHub user accepts the request and makes the binary available through CI.

[boscohyun]

First, sign up for a project on the DX team.