nixos: nix.sshServe: add trusted option

[MatthewCroughan]

Things done

It has become annoying enough to do the following config all the time, instead of allowing it to be in the sshServe option directly, that I thought I'd make a PR for it.

Before this change

  nix = {
    settings.trusted-users = [ "nix-ssh" ];
    sshServe = {
      protocol = "ssh-ng";
      enable = true;
      write = true;
      keys = [
        "ssh-ed25519 AAAAC3NzaC16"
      ];
    };
  };

After this change

  nix = {
    sshServe = {
      protocol = "ssh-ng";
      enable = true;
      write = true;
      trusted = true;
      keys = [
        "ssh-ed25519 AAAAC3NzaC16"
      ];
    };
  };

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

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[aprilthepink]

@ofborg eval

[numinit]

Seems like a pretty unambiguously convenient change. Thank you!