feat: Builder config settable with options

sw/builders/default.nix

@@ -0,0 +1,31 @@
+# ============================================================================
+# Builders Software Configuration
+# ============================================================================
+# Imports builder-specific programs and services (GitHub Actions runners, etc.)
+
+{
+  config,
+  lib,
+  pkgs,
+  inputs,
+  ...
+}:
+
+lib.mkMerge [
+  (import ./programs.nix {
+    inherit
+      config
+      lib
+      pkgs
+      inputs
+      ;
+  })
+  (import ./services.nix {
+    inherit
+      config
+      lib
+      pkgs
+      inputs
+      ;
+  })
+]

sw/builders/programs.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  lib,
+  pkgs,
+  inputs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.ugaif.sw;
+  basePackages = with pkgs; [
+    # Build-related packages can be added here if needed
+  ];
+in
+{
+  environment.systemPackages = subtractLists cfg.excludePackages (basePackages ++ cfg.extraPackages);
+}

sw/builders/services.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+with lib;
+
+let
+  cfg = config.ugaif.sw;
+  builderCfg = cfg.builders;
+in
+mkIf builderCfg.githubRunner.enable {
+  services.github-runners.${builderCfg.githubRunner.name} = {
+    enable = true;
+    url = builderCfg.githubRunner.url;
+    tokenFile = builderCfg.githubRunner.tokenFile;
+    extraLabels = builderCfg.githubRunner.extraLabels;
+    user = builderCfg.githubRunner.user;
+    workDir = builderCfg.githubRunner.workDir;
+    replace = true;
+  };
+}