Building docker image with nixos/nix fails with error: Package ‘tinycc-musl-unstable-2023-07-10-compiler’ in «unknown-file» is not available on the requested hostPlatform

[Xelef2000]

Describe the bug

I tried using the nixos/nix container to build docker containers in a 2-stage build process.
It works with some images, like redis, but fails with others, like bash.

This is the error I get:

5.29 installing 'bash-5.2.15'
15.42 error:
15.42        … while calling the 'derivationStrict' builtin
15.42          at <nix/derivation-internal.nix>:9:12:
15.42             8|
15.42             9|   strict = derivationStrict drvAttrs;
15.42              |            ^
15.42            10|
15.42 
15.42        … while evaluating derivation 'bash-5.2.15'
15.42          whose name attribute is located at /nix/store/6nnv8z57j976ij3img6ni46fkbac9vb0-nixpkgs/nixpkgs/pkgs/os-specific/linux/minimal-bootstrap/bash/2.nix:81:15
15.42 
15.42        … while evaluating attribute 'PATH' of derivation 'bash-5.2.15'
15.42          at /nix/store/6nnv8z57j976ij3img6ni46fkbac9vb0-nixpkgs/nixpkgs/pkgs/os-specific/linux/minimal-bootstrap/bash/2.nix:104:7:
15.42           103|       SHELL = "${bash_2_05}/bin/bash";
15.42           104|       PATH = lib.makeBinPath ((env.nativeBuildInputs or []) ++ [
15.42              |       ^
15.42           105|         bash_2_05
15.42 
15.42        (stack trace truncated; use '--show-trace' to show the full trace)
15.42 
15.42        error: Package ‘tinycc-musl-unstable-2023-07-10-compiler’ in «unknown-file» is not available on the requested hostPlatform:
15.42          hostPlatform.config = "x86_64-unknown-linux-gnu"
15.42          package.meta.platforms = [
15.42            "i686-linux"
15.42          ]
15.42          package.meta.badPlatforms = [ ]
15.42        , refusing to evaluate.
15.42 
15.42        a) To temporarily allow packages that are unsupported for this system, you can use an environment variable
15.42           for a single invocation of the nix tools.
15.42 
15.42             $ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1
15.42 
15.42           Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
15.42                 then pass `--impure` in order to allow use of environment variables.
15.42 
15.42        b) For `nixos-rebuild` you can set
15.42          { nixpkgs.config.allowUnsupportedSystem = true; }
15.42        in configuration.nix to override this.
15.42 
15.42        c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
15.42          { allowUnsupportedSystem = true; }
15.42        to ~/.config/nixpkgs/config.nix.

When adding the NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 env var, the build fails with a 904.2 ./arch/x32/crt_arch.h:12: error: unknown register %rbp

Steps To Reproduce

1. Build this Dockerfile:

FROM nixos/nix
RUN mkdir -p /output/store
RUN nix-channel --update
RUN nix-env --profile /output/profile -i bash

RUN cp -va $(nix-store -qR /output/profile) /output/store

FROM scratch
COPY --from=0 /output/store /nix/store
COPY --from=0 /output/profile/ /usr/local/
ENTRYPOINT [ "/usr/local/bin/bash" ]

Expected behavior

The container should be built successfully.