Docker/docker-compose has much of the "easy to ship" magic that Heroku had for me in its early years, I very quickly abandoned Heroku for my own container stacks not long after Docker launched in 2013. Its not quite as friendly or easy as Heroku was at its best, but its a completely open format and works with so many different providers etc etc.
When you can just get a database in a container with one line in docker or a handful of lines of yaml in a compose file, the magic of heroku deploying a production database instance easily isn't quite as special as it once was.
That Dokku, the open source Heroku alternative, is at heart a Docker container manager suggests I wasn't the only person with these thoughts.
