Thanks for that pointer, I hadn’t found that thread when I searched. Looking at this particular post with “instructions” (they are from the Docker forum, discussing docker containers in general):
… it looks similar to the setup I see, but the aspect that’s not clear to me is whether or not it’s intended to have two images: discourse/base and discourse_latest/app image. The instructions from that [post from Docker forums seem to assume this wasn’t an intended behavior, but a remnant from unintended actions that resulted into two images instead of one.
Could someone knowledgeable (dev?) confirm?