I have a question about why the HOME directory is not being set/used in the way I expect within the Dockerfile. Would this be on topic for ServerFault (because the question is about Docker, and hence "server administration" in that loosest sense), or is it more suitable for Stack Overflow?
I think anything that is related to operating servers and server technologies belong to Server Fault, even if it seems like it's programming. System Administrators should do some programming - programming to automate, to deploy, manage, etc. This question would be useful and more appropriate than many of the questions that get posted on SF every day!