Best practices when building container images using nixpkgs tooling

Hey, I’ve run into a situation where in order to run some application in a reasonable way (e.g. run it 24x7 on a low-power host that did not run NixOS), the path of least resistance was to put it in a container.. but the issue was that the app required some odd system dependencies that were awful to wrangle into submission. The application was nothing to write home about - just some microservice with a GUI I made for myself ages ago, but I thought that instead of starting with a common base ima...