I think whoever came up with this at Bunny is missing the magic sauce of Heroku. That magic sauce is Devs don't have to think about container builds/finding a container registry and creating a Dockerfile. They just fling code at Git and shows up running in production if Heroku supported the language and framework. Bunny just created their version of Cloud Run.

As SRE, one of most frustrating aspects of my job is dealing with that behavior.