> something like Heroku that I can use with my own VPSs and I'll gladly pay you $10/month.
You could try something like Dokku, Docker powered mini-Heroku https://github.com/progrium/dokku
If I am not wrong, DigitalOcean has dokku-installed images which you can just use within a few minutes.
Yeah, they do. Flynn (http://flynn.io) and Deis (http://deis.io/) are other popular choices, though Flynn is extremely new and difficult to get running properly, and it's not production ready. Deis is based on CoreOS now so it won't work on Digital Ocean at the moment if you prefer using them.
You could try something like Dokku, Docker powered mini-Heroku https://github.com/progrium/dokku If I am not wrong, DigitalOcean has dokku-installed images which you can just use within a few minutes.