Major Description
Following the instructions on building in `incubator-trafficcontrol/BUILD.md` produces a `dist` directory and its contents that are all owned by root, so the owner of the directory can't delete them without sudo.
In the Jenkins build, the artifacts from previous builds don't get cleaned out because they aren't owned by Jenkins. The docker build should ensure the files there are owned by the same user:group as owns the incubator-trafficcontrol directory itself.
