installing on GitHub Actions

[lkeegan]

For convenience when running on github actions CI I created setup-mesa-dist-win, an action which downloads and runs the systemwidedeploy.cmd installation script.

To use it just add this line to your yaml config:

   - uses: ssciwr/setup-mesa-dist-win@v2

Sharing this here in case it is useful for other people.

Many thanks for creating and maintaining this resource!