Based on my reading of the base shiny image I see:

https://github.com/rocker-org/shiny#connecting-app-and-log-directories-to-host

or:

https://github.com/rocker-org/shiny/blob/master/docker-compose.yml#L27

As well from their example docker-compose.yml: https://github.com/rocker-org/shiny/blob/master/docker-compose.yml#L23

I haven't run this yet but mounting logs to a local volume sounds good in theory, makes the app less stateful (you can kill the docker etc... and the logs live on somewhere)

In their example docker-compose.yml they have it run under root to run on port 80, is there a config for port? I'd imagine a production deployment of this would use nginx in front of it so you could pass 443 to whatever port you have open. Just curious on that!

I think for the port thing that's going to be pretty dependent on heroku, which I think doesn't do compose, so we can figure that out when we get to it.

The logs thing totally doable, I rigged up a log dir appropriately. Let me see if I can set up the app itself to link with a volume too.

rough edges should be sanded off now.