[hinkley]

I barely have a horse in this race, but I think what I'd like to see is more apps that behave like 'npm config' or 'git config' where you can imperatively change one configuration value.

I take your image as the FROM for my own Dockerfile, tweak a few settings, maybe alter the CMD, and then run my image instead of trying to do some sort of ad absurdum variation on a Twelve Factor App.