I was thinking that there would be a generic Rails container (like a Heroku buildpack), that reads the location of your Rails code from the configuration, downl

I was thinking that there would be a generic Rails container (like a Heroku buildpack), that reads the location of your Rails code from the configuration, downloads it, and runs it. So, just like Heroku buildpacks, you can create your own, and you can even create one with your app baked in; but most people would end up using an off-the-shelf container. But this is just my interpretation! Your approach may be better, and it doesn't look like CoreOS will care which way you want to do things!