feat(gc): init

modules/nixos/gc.nix

@@ -0,0 +1,16 @@
+{ config, lib, pkgs, ... }:
+
+let cfg = config.sydnix.gc;
+in {
+  options.sydnix.gc = {
+    enable = lib.mkEnableOption "the automatic Nix garbage collector";
+  };
+
+  config = lib.mkIf cfg.enable {
+    nix.gc = {
+      automatic = true;
+      randomizedDelaySec = "14m";
+      options = "--delete-older-than 30d";
+    };
+  };
+}