Output generated build version

[FancyFurret]

Context

In my CI setup I am building my project using unity-builder, then pushing a release to itch.io using butler. It is possible to tell itch.io the version of the game you are uploading, and it would be nice to use the same version that unity-builder generates for consistency.

Suggested solution

The simplest solution would be to expose the generated version as an action output.

Considered alternatives

The version could technically be parsed from the build log using grep, but that would be slow and would be easy to break.

Additional details

Currently working on a PR 😄