Add tips

tips/how_to_test_pr.md

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+# Example for ollama
+
+{ config, pkgs, lib, ... }:
+
+with lib;
+let
+  cfg = config.modules.system.server.ollama;
+  nvidiaEnabled = config.modules.system.hardware.nvidia.enable;
+  nixpkgsPr = builtins.fetchTarball {
+    url = "https://github.com/abysssol/nixpkgs/archive/ollama-driver-runpath.tar.gz";
+    sha256 = "1ixfvdpi2v4r9yrkvqnfk9whs8lyjhrkdph47bcznh8ak9aipr8p";
+  };
+in
+{
+  disabledModules = [ "services/misc/ollama.nix" ];
+  imports = [
+    (import "${nixpkgsPr}/nixos/modules/services/misc/ollama.nix")
+  ];
+
+  options.modules.system.server.ollama = {
+    enable = mkEnableOption ''
+      Enable ollama with my custom configurations
+    '';
+  };
+  config = mkIf cfg.enable {
+    services.ollama = {
+      enable = true;
+
+      package = (import nixpkgsPr { inherit (pkgs) system; config.allowUnfree = true; }).ollama;
+
+      acceleration = if nvidiaEnabled then "cuda" else null;
+    };
+  };
+}