So you want to have your suite run on rubybench bare metal server right?
Okay, then maybe the best way would be to make new directory and place your Dockerfile in ruby-bench-docker repo against which we can make further discussion (on pull request)?
If I am getting this correctly, suite is intended to run against specific Discourse version, specific Ruby version and specific Rails version. Therefore you want these three to be configurable – later we can make script which would run container by passing versions.
Once we have Dockerfile on ruby-bench-docker repo, we can easily push it to dockerhub and pull it on bare metal server for running.
Hope it helps,
Cheers 