bug: home manager fails to install in the official nix docker container

[darthdeus]

Are you following the right branch?

• [X] My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• [X] I have searched the existing issues

Issue description

Installing home manager in a clean official nix docker container fails with a conflict. Full Dockerfile

FROM nixos/nix

RUN nix-channel --add https://github.com/nix-community/home-manag
    && nix-channel --update

RUN nix-shell '<home-manager>' -A install

Fails with

/nix/store/8gm6l0hvyfg1vhhzr67zkv1ipjj7cqmz-home-manager-generation
Starting Home Manager activation
Activating checkFilesChanged
Activating checkLinkTargets
Activating writeBoundary
Activating installPackages
installing 'home-manager-path'
building '/nix/store/6zfy37i1frfgjw6vcn0rrkj8pkq5127i-user-environment.drv'...
error: Unable to build profile. There is a conflict for the following files:

         /nix/store/7vj5s0nmbkq7qcw3q5397zwg5c12a669-home-manager-path/bin/mandb
         /nix/store/vr04ag53qddlr77886lq9mmssibbaz18-man-db-2.11.2/bin/mandb
error: builder for '/nix/store/6zfy37i1frfgjw6vcn0rrkj8pkq5127i-user-environment.drv' failed with exit code 1

Oops, Nix failed to install your new Home Manager profile!

Perhaps there is a conflict with a package that was installed using
"nix-env -i"? Try running

    nix-env -q

and if there is a conflicting package you can remove it with

    nix-env -e {package name}

Then try activating your Home Manager configuration again.
Uh oh, the installation failed! Please create an issue at

    https://github.com/nix-community/home-manager/issues

if the error seems to be the fault of Home Manager.
The command '/bin/sh -c nix-shell '<home-manager>' -A install' returned a non-zero code: 1

I checked and the nix channel is unstable as should be matching home manager

bash-5.2# nix-channel --list
home-manager https://github.com/nix-community/home-manager/archive/master.tar.gz
nixpkgs https://nixos.org/channels/nixpkgs-unstable

All that needs to be done to reproduce is just create a Dockerfile with the above content and run docker build -t foo .

Maintainer CC

No response

System information

- system: `"x86_64-linux"`
 - host os: `Linux 6.1.55-1-lts`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.18.1`
 - channels(root): `"home-manager, nixpkgs"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixpkgs`

[dawidd6]

Related: https://github.com/nix-community/home-manager/issues/2995

https://github.com/nix-community/home-manager/pull/4421 might fix this

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