using rustup in debian:latest docker image on macos x86_64 gives wrong version of rust (that won't run)

Problem

installing rust via rustup on a debian:latest dockerimage on macos x86_64 seems to install 32 bit version of rust that doesn't run under the image.

$ rustc
error: command failed: 'rustc': No such file or directory (os error 2)

Steps

Dockerfile

FROM debian:latest

RUN apt-get update
RUN apt-get install -y gcc libc6-dev wget curl file
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y

CMD bash

$ docker build . --progress=plain -t rustdev > builder.log 2>&1
$ docker run -it rustdev bash

Possible Solution(s)

No response

Notes

$ file ~/.cargo/bin/rustc

/root/.cargo/bin/rustc: ELF 32-bit LSB pie executable, Intel 80386, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.2, for GNU/Linux 2.6.32, with debug_info, not stripped

Rustup version

rustup 1.26.0 (5af9b9484 2023-04-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `(error reading rustc version)`

Installed toolchains

Default host: x86_64-unknown-linux-gnu
rustup home:  /root/.rustup

stable-x86_64-unknown-linux-gnu (default)
(error reading rustc version)

Start by reproducing the issue with the Dockerfile in the report on macOS x86_64, then inspect the installed rustc with file and compare it with the reported x86_64-unknown-linux-gnu host. Read the rustup installation and host-detection behavior involved in that environment. Done means rustup installs a rustc binary that runs successfully in the debian:latest container.