Remove Dockerfile

One can generate a new layer with nix-channel --update
from https://hub.docker.com/r/nixos/nix/

This file wasn't maintained.

maintainers/docker/.dockerignore

@@ -1,14 +0,0 @@
-*~
-,*
-.*.swp
-.*.swo
-result
-result-*
-/doc/NEWS.html
-/doc/NEWS.txt
-/doc/manual.html
-/doc/manual.pdf
-.version-suffix
-
-.DS_Store
-.git

maintainers/docker/Dockerfile

@@ -1,12 +0,0 @@
-FROM busybox
-
-RUN dir=`mktemp -d` && trap 'rm -rf "$dir"' EXIT && \
-    wget -O- https://nixos.org/releases/nix/nix-1.7/nix-1.7-x86_64-linux.tar.bz2  | bzcat | tar x -C $dir && \
-    mkdir -m 0755 /nix && USER=root sh $dir/*/install && \
-    echo ". /root/.nix-profile/etc/profile.d/nix.sh" >> /etc/profile
-
-ADD . /root/nix/nixpkgs
-ONBUILD ENV NIX_PATH nixpkgs=/root/nix/nixpkgs:nixos=/root/nix/nixpkgs/nixos
-ONBUILD ENV PATH /root/.nix-profile/bin:/root/.nix-profile/sbin:/bin:/sbin:/usr/bin:/usr/sbin
-ONBUILD ENV ENV /etc/profile
-ENV ENV /etc/profile