add systems

modules/systems/nix/common.nix

@@ -1,8 +1,30 @@
 {
   nixpkgs.config.allowUnfree = true;
 
-  nix.settings.experimental-features = [
-    "nix-command"
-    "flakes"
-  ];
+  nix.settings = {
+    experimental-features = [
+      "nix-command"
+      "flakes"
+    ];
+
+    extra-substituters = [
+      "https://cache.nixos.org"
+      "https://nix-community.cachix.org"
+      "https://moons-dotfiles.cachix.org"
+      "https://noctalia.cachix.org"
+      "https://vicinae.cachix.org"
+      "https://cache.numtide.com"
+      "https://codex-desktop-linux.cachix.org"
+    ];
+
+    extra-trusted-public-keys = [
+      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "moons-dotfiles.cachix.org-1:WHoroKiNScG2/dpxHHL1I0qVmvuQhJbEAP+DS2j9Rr0="
+      "noctalia.cachix.org-1:pCOR47nnMEo5thcxNDtzWpOxNFQsBRglJzxWPp3dkU4="
+      "vicinae.cachix.org-1:1kDrfienkGHPYbkpNj1mWTr7Fm1+zcenzgTizIcI3oc="
+      "niks3.numtide.com-1:DTx8wZduET09hRmMtKdQDxNNthLQETkc/yaX7M4qK0g="
+      "codex-desktop-linux.cachix.org-1:nX/xy6AdK9hQE24A8ALGjkCKj2ObFmcnemiL5Cid4nk="
+    ];
+  };
 }

modules/systems/nix/darwin.nix

@@ -0,0 +1,16 @@
+{
+  nix.gc = {
+    automatic = true;
+    interval = [
+      {
+        Weekday = 7;
+        Hour = 3;
+        Minute = 15;
+      }
+    ];
+    options = "--delete-older-than 14d";
+  };
+
+  nix.settings.auto-optimise-store = true;
+  nix.optimise.automatic = true;
+}

modules/systems/nix/nixos.nix

@@ -0,0 +1,8 @@
+{
+  nix.gc.automatic = false;
+  nix.settings.auto-optimise-store = true;
+  nix.optimise = {
+    automatic = true;
+    dates = [ "weekly" ];
+  };
+}