added automatic nix-store optimisation

hosts/common/autoupdate.nix

@@ -0,0 +1,11 @@
+{ pkgs, ... }:
+{
+  system.autoUpgrade = {
+    enable = true;
+    dates = "04:00";
+    flake = "https://git.huwe.mooo.com/willifan/nix-config.git";
+    persistent = true;
+    randomizedDelaySec = "5min";
+    fixedRandomDelay = true;
+  };
+}

hosts/common/default.nix

@@ -1,4 +1,9 @@
 { pkgs, ... }:
 {
+  imports = [
+    ./autoupdate.nix
+    ./garbage-collect.nix
+    ./optimise.nix
+  ];
   system.stateVersion = "23.11";
 }

hosts/common/garbage-collect.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+{
+  nix.gc = {
+    automatic = true;
+    dates = "04:30";
+    persistent = true;
+    options = "--delete-older-than 10d";
+  };
+}

hosts/common/optimise.nix

@@ -0,0 +1,7 @@
+{ pkgs, ... }:
+{
+  nix.optimise = {
+    automatic = true;
+    dates = [ "05:00" ];
+  };
+}