docker: add docu references & remove duplicate code #13328
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Motivation
we build a docker image with nix.
docker.nix is complex + without docu references and docker.nix looks like a template rather than a reuse function. General functionality which do not need a refactoring can get moved to nixpkgs, in order to avoid code duplication.
Context
https://discourse.nixos.org/t/how-to-build-a-docker-image-with-a-working-nix-inside-it/32960
Requires NixOS/nixpkgs#414221 to be merged