Investigate sbt-github-actions to generate github actions

To help us creating gihub actions,
https://github.com/djspiewak/sbt-github-actions

may help.

See how it fits in our project and what it could bring.

Start by reviewing the sbt-github-actions project linked in the issue and then examine how this Scala project currently defines its build and GitHub Actions configuration. Determine whether the tool fits Nexus and document the concrete benefits, limitations, and integration scope. Done means the project has a clear adoption decision and defined next steps.

Written by the indexing model from the issue text.