set up cachix

configuration.nix

@@ -234,6 +234,7 @@ xclip # manipulate clipboard from scripts
 
 # NIX
 nixfmt # linting
+cachix # why spend time compiling?
 
 # PYTHON.
 python3 # base language
@@ -697,12 +698,27 @@ networking.firewall.allowedTCPPorts = [ 25152 80 443 ];
 networking.firewall.allowedUDPPorts = [ 25152 80 443 ];
 # networking.firewall.enable = false;
 
-system.copySystemConfiguration = true;
-nix.gc = {
-  automatic = true;
-  dates = "weekly";
+system = {
+  copySystemConfiguration = true;
+  stateVersion = VERSION;
+};
+nix = {
+  settings = {
+    substituters = [
+      "https://nix-gaming.cachix.org"
+      "https://nixpkgs-python.cachix.org"
+      "https://devenv.cachix.org"
+    ];
+    trusted-public-keys = [
+      "nix-gaming.cachix.org-1:nbjlureqMbRAxR1gJ/f3hxemL9svXaZF/Ees8vCUUs4="
+      "nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU="
+      "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw="
+    ];
+  };
+  gc = {
+    automatic = true;
+    dates = "weekly";
+  };
 };
 
-system.stateVersion = VERSION;
-
 }