What is the current workflow to debug Travis builds locally?

Question

One used to be able to download Vagrant boxes to debug Travis builds (for GitHub projects for instance). Apparently, this is no longer possible, so how do people currently debug

Answer 1

I had a crack at making a docker file for JVM builds here which works well for me. It is based of the travis published containers and utilises the Travis CLI and Travis Build projects to be able to run your .travis.yml file within a docker container.

A built JVM image is on docker hub.