modules: move builder into common

modules/darwin/common/builder.nix

@@ -0,0 +1,23 @@
+{
+  config,
+  inputs,
+  pkgs,
+  ...
+}:
+{
+  nix.gc.automatic = false;
+
+  launchd.daemons.free-space = {
+    serviceConfig = {
+      StartCalendarInterval = [ { Minute = 15; } ];
+    };
+    path = [
+      config.nix.package
+      pkgs.coreutils
+    ];
+    script = builtins.readFile "${inputs.self}/modules/shared/free-space.bash";
+  };
+
+  # https://github.com/LnL7/nix-darwin/blob/230a197063de9287128e2c68a7a4b0cd7d0b50a7/modules/nix/default.nix#L201
+  nix.daemonProcessType = "Interactive";
+}