DRAFT: Build via GH Actions

[kreghek]

Do you have a forum thread linked to this PR? No

What will this PR bring to the project for everyone? You can dowload game, play and fast see/

Why are these changes necessary? Add UNITY_LICENCE to github secrets https://unity-ci.com/docs/github/activation

How did you implement them? main.yml is workflow to build project. After success build you can download artefacts under different arget planform.

[CLAassistant]

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:x: Куркутов П.А
:x: kreghek

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[kreghek]

Can we find a way to keep the version defined in the workflow in sync with unity version of the project ? I think we could add a step in it to detect the version, without writing the version explicitly.

I will try