[nix] Adds GC

system/features/gc.nix

@@ -0,0 +1,8 @@
+{ ... }: {
+  # Automatic
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+}

system/hosts/altair/default.nix

@@ -4,6 +4,7 @@
     ./configuration.nix
     ./hardware-configuration.nix
     ../../authorized-keys.nix
+    ../../features/gc.nix
     ../../features/gui.nix
   ];
 

system/hosts/mcp/default.nix

@@ -5,6 +5,7 @@
     ./hardware-configuration.nix
     ../../authorized-keys.nix
     inputs.sops-nix.nixosModules.sops
+    ../../features/gc.nix
   ];
 
   nixpkgs.config.allowUnfree = true;

system/hosts/vega/configuration.nix

@@ -1,12 +1,4 @@
-# Edit this configuration file to define what should be installed on
-# your system.  Help is available in the configuration.nix(5) man page
-# and in the NixOS manual (accessible by running ‘nixos-help’).
-
-{
-  pkgs,
-  ...
-}:
-
+{ pkgs, ... }:
 {
   networking.hostName = "vega"; # Define your hostname.
 

system/hosts/vega/default.nix

@@ -4,6 +4,7 @@
     ./configuration.nix
     ./hardware-configuration.nix
     ../../authorized-keys.nix
+    ../../features/gc.nix
     ../../features/gui.nix
   ];