nix build --file docker.nix \                                                
                       --arg uid 1000 \
                       --arg gid 1000 \
                       --argstr uname user \
                       --argstr gname user \
                       --argstr name nix-user \
                       --out-link nix-user.tar.gz
error: cannot evaluate a function that has an argument without a value ('pkgs')
       Nix attempted to evaluate a function as a top level expression; in
       this case it must have its arguments supplied either by default
       values, or passed explicitly with '--arg' or '--argstr'. See
       https://nixos.org/manual/nix/stable/language/constructs.html#functions.
       at /home/gmarti/dev/nix/docker.nix:3:3:
            2|   # Core dependencies
            3|   pkgs,
             |   ^
            4|   lib,