My company does automatic setup too (https://circleci.com https://circleci.com). However, we went in a different direction than Heroku, and allow people to nail

My company does automatic setup too (https://circleci.com https://circleci.com). However, we went in a different direction than Heroku, and allow people to nail down the exact version of their platform they want to use (for example, our users use over 30 different Ruby versions). We haven't needed the same flexibility for DBs and libraries, but I imagine that will come.