sddm-tokyo-night: init at 0-unstable-2023-06-13

[tohmais]

Added the SDDM theme, tokyo-night-sddm, which is based on sugar dark. Edited the name slightly to be more consistent with other SDDM theme packages.

First time contributor, so please tell me if I screwed something up! (My editor did formatting changes to the maintainer list, but I caught it and reverted them.

I found using some of the other SDDM theme packages frustrating, so I'm using propagatedUserEnvPkgs instead of propagatedBuildInputs or similar. That means you install the theme by:

services.displayManager.sddm = {
  enable = true;  
  theme = "tokyo-night";
};

environment.systemPackages = [ pkgs.sddm-tokyo-night];

Instead of having to add the package to both environment.systemPackages and services.displayManager.sddm.extraPackages.

Things done

• 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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[tohmais]

Gonna close this because I didn't follow commit guidelines. Will reopen with better commits.