There is an updated pull request by bobertlo against master on the void-packages repository

https://github.com/bobertlo/void-packages travis-docker
https://github.com/void-linux/void-packages/pull/14742

common/travis/docker.sh: add control variables
for more flexible local testing using existing tools

A patch file from https://github.com/void-linux/void-packages/pull/14742.patch is attached