tweak the docker build

[dcburleigh]

I ran into some issues when building this in a Docker container.
I got a clean build with these changes. I couldn't find any documentation for the 'lt' command, which doesn't exist on any system I use, so I commented it out. But it looks like it is checking if the container is already running? Also a few changes just for personal preference (.e.g. setting the container name explicitly). I tried to make each change one atomic commit.