add personal cache

modules/features/system/system-nix.nix

@@ -3,7 +3,7 @@
   config.dendritic.features.system-nix = {
     nixosModules = [
       (
-        { config, ... }:
+        { config, pkgs, ... }:
 
         let
           user = config.dendritic.current.primaryUser;
@@ -29,6 +29,16 @@
           services.fstrim.enable = true;
 
           time.timeZone = "America/Toronto";
+          nix.settings = {
+            substituters = [
+              "https://cache.gwg313.xyz/mycache?priority=5"
+            ];
+            trusted-public-keys = [
+              "mycache:ovUjiiyQNUGjK8yZA4dPV1f8tIfCZrGIubdWvWpdvtc="
+            ];
+          };
+
+          environment.systemPackages = [ pkgs.attic-client ];
         }
       )
     ];

modules/nixos/hosts/candlekeep/zerotier.nix

@@ -13,5 +13,6 @@
     192.168.194.54 graphene.zt
     192.168.191.218 candlekeep.zt
     192.168.191.201 grymforge.zt
+    192.168.191.202 cache.gwg313.xyz
   '';
 }

modules/nixos/hosts/grymforge/zerotier.nix

@@ -13,5 +13,6 @@
     192.168.194.54 graphene.zt
     192.168.191.218 candlekeep.zt
     192.168.191.201 grymforge.zt
+    192.168.191.202 cache.gwg313.xyz
   '';
 }