[Feature Request] Add option to set user profile picture via AccountsService

[birneee]

Module Name

home-environment.nix

Requested Feature

Enable homemanager to manage user profile pictures.

I currently if have this in my configuration, but I would like to see this feature upstreamed. I am not very familiar with the inner workings of homemanager, so I am not sure if this is the right approach:

{
  config,
  lib,
  pkgs,
  ...
}:

{
  options.home.usericon = lib.mkOption {
    type = lib.types.nullOr lib.types.path;
    default = null;
    description = "Path to the user's profile picture.";
  };

  config = lib.mkIf (config.home.usericon != null && pkgs.stdenv.isLinux) {
    home.activation.configureUserIcon = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
      if [ -z "''${DRY_RUN:-}" ]; then
        ${pkgs.systemd}/bin/busctl call \
          org.freedesktop.Accounts \
          /org/freedesktop/Accounts/User$UID \
          org.freedesktop.Accounts.User \
          SetIconFile \
          s "${config.home.usericon}"
      fi
    '';
  };
}

Current Limitations

Currently, homemanager cannot set the user profile picture.

Additional Context

No response