- actions/setup-ruby does not work on new GHA runners Ubuntu 20.04 (missing bundler in 2.5) as per https://github.com/actions/setup-ruby/issues/70 - might be deprecated as per https://github.com/actions/setup-ruby/issues/80 - https://github.com/ruby/setup-ruby is recommended is superior
- this adds a new workflow for Github Actions that mirrors what the existing Travis CI workflow tests - Travis CI might become unfriendly to opensource soonish so migration might be necessary