The original idea to learn to use docker was to compile and run a wallet deamon very easily. Then it became wow this is so easy why not run this for more than just staking Denarius.

After seeing just how easy the daemons were to compile and run, I realized I could cleanly run a wallet, get the address and private keys and mine to that. Which lead me to why I was trying to figure out how to get the QT compiled and running in docker.

Why would someone want to do this? Well if you have the Dockerfile setup for a few different bitcoin forks, you can easily modify that Dockerfile template and build a wallet very fast without screwing around with your current OS and dependencies. Also this linux QT can be built in Linux, Windows or MacOS.

So now using a few templates I can compile a wallet from source cleanly inside of its own docker container. This is extremely powerful and why I was spending so much time seeing how this works.

Examples
https://github.com/buzzkillb/denariusQTdocker
https://github.com/buzzkillb/voltaQTdocker

Example what the Denarius QT looks like running in Ubuntu 19.04