Initial nix docker image

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+# Dockerfile to create an environment that contains the Nix package manager.
+FROM alpine
+
+ARG NIX_VERSION
+ENV NIX_VERSION ${NIX_VERSION:-2.1.3}
+
+RUN addgroup -g 30000 -S nixbld \
+    && for i in $(seq 1 30); do adduser -S -D -h /var/empty -g "Nix build user $i" -u $((30000 + i)) -G nixbld nixbld$i ; done \
+    && adduser -D nixuser \
+    && mkdir -m 0755 /nix && chown nixuser /nix \
+    && apk add --no-cache bash \
+    && rm -rf /var/cache/apk/*
+
+USER nixuser
+ENV USER=nixuser
+ENV HOME="/home/nixuser"
+
+RUN cd && wget https://nixos.org/releases/nix/nix-$NIX_VERSION/nix-$NIX_VERSION-x86_64-linux.tar.bz2 \
+    && tar xjf nix-*-x86_64-linux.tar.bz2 \
+    && ~/nix-*-x86_64-linux/install \
+    && rm -rf ~/nix-*-*
+
+ENV ENV="/home/nixuser/.nix-profile/etc/profile.d/nix.sh"
+RUN ln -s ${ENV} ${HOME}/.profile
+SHELL ["/usr/bin/env", "bash", "-l", "-c"]