Heh, looks like the author fixed this [1] and it now uses the technique you suggest, based on issue #22 [2] which restates the same thing as your comment, basically chaining everything together with `&&` in a single `RUN` entry.

[1] https://github.com/iron-io/dockers/commit/71687edb849dcb9079... [2] https://github.com/iron-io/dockers/issues/22