Where do you plan to deploy? Its easy enough to deploy to Heroku, and I imagine dockerizing an Elixir app is also a straightforward process. If, on the other hand, you are taking a more traditional approach and just deploying to a Linux box/vps there are solutions for that too (i.e. Chef, Capistrano).

It should be pretty far down in the list of things that influence your choice, imo, since it's basically a solved problem.