I might be a little confused. I'm assuming that when I set a base docker image for a task and run it, trains-agent runs a container from that image, then clones the git repository into that image, then applies all the changes/packages trains detected and runs the script. But what I'd really like to do is for trains-agent to pull a repository that includes a Dockerfile, build that dockerfile, run the resulting container, and then execute the script within it.