Describe the bug

As title says, when a nixos configuration is defined through a flake if nixpkgs.config.permittedInsecurePackages is specified in multiple files the values will not be merged, only the first will be used.

Steps To Reproduce

Steps to reproduce the behavior:

1. Create a flake with a nixos configuration
2. Include two modules which both define a value for permittedInsecurePackages
3. Check that only the first one is applied

I made an example repo with a minimal flake to reproduce.

Expected behavior

If this is intended behavior a warning should be printed, otherwise the values in all files should be merged.

Screenshots

Metadata

• system: "x86_64-linux"
• host os: Linux 6.6.54, NixOS, 24.05 (Uakari), 24.05.20241007.1bfbbbe
• multi-user?: yes
• sandbox: yes
• version: nix-env (Lix, like Nix) 2.91.0 System type: x86_64-linux Additional system types: i686-linux, x86_64-v1-linux, x86_64-v2-linux, x86_64-v3-linux Features: gc, signed-caches System configuration file: /etc/nix/nix.conf User configuration files: /home/husky/.config/nix/nix.conf:/etc/xdg/nix/nix.conf:/home/husky/.nix-profile/etc/xdg/nix/nix.conf:/nix/profile/etc/xdg/nix/nix.conf:/home/husky/.local/state/nix/profile/etc/xdg/nix/nix.conf:/etc/profiles/per-user/husky/etc/xdg/nix/nix.conf:/nix/var/nix/profiles/default/etc/xdg/nix/nix.conf:/run/current-system/sw/etc/xdg/nix/nix.conf:/nix/store/jwpaz9v4rbifn6ydy0d8ka1rkid1yibc-gnome-settings-daemon-46.0/etc/xdg/nix/nix.conf Store directory: /nix/store State directory: /nix/var/nix Data directory: /nix/store/lyh0wy4mxmblg3s2isf180qx3wx64mz1-lix-2.91.0/share
• channels(root): "nixos-23.05, nixos-unstable"
• nixpkgs: /nix/store/a2gnsay8asfn2kqghz12nhw196cnmf8h-source

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@NixOS/stdenv

Note for maintainers: Please tag this issue in your PR.

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