nix-config/modules/nixos/home-manager-adaptors/openssh.nix

{...}: {
  flake.nixosModules.home-manager-openssh = {
    config,
    lib,
    ...
  }: {
    users.users =
      lib.attrsets.mapAttrs (name: value: {
        openssh.authorizedKeys.keys = value.programs.openssh.authorizedKeys;
      })
      config.home-manager.users;
  };
}