What was the issue:
To prepare the fix for bundle exec fastlane output only printed, once command finished, i moved the rubycmd package to go-utils as rubycommand, related pr: https://github.com/bitrise-io/go-utils/pull/44
The fix were introduced in pr: https://github.com/bitrise-io/steps-fastlane/pull/22
- use shared rubycommand package
- fix command workdir
fastlane step new version 2.3.1 shared in the steplib.