Move entrypoint and cmd near the bottom of the Dockerfile
Move entrypoint and cmd near the bottom of the Dockerfile

* This seems to be convention. I noticed when coming back to this
  project after a few weeks of looking at lots of other Dockerfiles
  "in the wild" I naturally looked at the bottom of the file for these
  directives, and remembered that I put them at the top. I figure this
  may be the case for others so I am moving it lower to make things
  easier for others to understand.

dkubb/haskell-builder