Add support for Scala

[zaoqi]

No description provided.

[electrum]

It looks like Scala is already supported: https://github.com/actions/starter-workflows/blob/master/ci/scala.yml

[joshmgross]

Thanks @electrum

@zaoqi please see the starter workflows for an example of using Scale with GitHub Actions
https://github.com/actions/starter-workflows/blob/master/ci/scala.yml

[curtcox]

This issue was closed, but never fixed. Issue #266 is the currently open equivalent. The linked scala.yml will fail because it doesn't find sbt.