Nix in Ubuntu for Docker

Dockerfile

FROM ubuntu:22.04

ARG USER=user
ARG HOME=/home/${USER}
ARG DEBIAN_FRONTEND=noninteractive

ENV USER=${USER}

RUN apt update && apt install -y sudo wget xz-utils && rm -rf /var/lib/apt/lists/*

RUN addgroup --gid 1000 ${USER} \
    && adduser --uid 1000 --ingroup ${USER} --home ${HOME} \
        --shell $(which bash || which sh) \
        --disabled-password --gecos "" ${USER} \
    && echo "${USER} ALL=(ALL:ALL) NOPASSWD: ALL" > /etc/sudoers.d/20-nix-user

ARG NIX_VERSION=2.11.0
ARG NIX_RELEASE=https://releases.nixos.org/nix/nix-${NIX_VERSION}/nix-${NIX_VERSION}-x86_64-linux.tar.xz

RUN wget -O - ${NIX_RELEASE} | tar -C /tmp -xJf - \
    && mv /tmp/nix-* /tmp/nixos \
    && mkdir /nix \
    && chown ${USER}:${USER} /nix \
    && su - ${USER} -c '/tmp/nixos/install -- --no-daemon' \
    && su - ${USER} -c '${HOME}/.nix-profile/bin/nix-env -u --always' \
    && echo ". ~/.nix-profile/etc/profile.d/nix.sh" >> ${HOME}/.bashrc \
    && echo 'export PATH=$PATH:'${HOME}'/.nix-profile/bin' >> /root/.bashrc \
    && rm -rf /tmp/nix*

USER ${USER}:${USER}
WORKDIR ${HOME}