Build Scalatra docs on GitHub Actions

• https://scalatra.github.io/scalatra-docbuild/

Docs	Repo	Branch	Built with
Site	https://github.com/scalatra/scalatra-website	master	Hugo

Options to trigger a build:

• Push a dummy change to branch master
• Invoke GitHub Actions https://github.com/scalatra/scalatra-docbuild/actions

TODO

• trigger build for push to branch master on repo scalatra-website
• remove || true for hugo build