I've also done this with Dokku specifically and it was really cool. The project has probably matured a lot since then (8+ months ago) but...I do have a pretty high level of trust in Heroku that's been hard to erode.

(Waiting for all the comments saying I shouldn't have that trust in t-minus...)

Yep. Dokku is another option since you've work with Heroku before. But Heroku is so expensive.