feat: Disable some remote substituters

nixos/ryu/configuration.nix

@@ -47,7 +47,7 @@
       auto-optimise-store = true;
       extra-experimental-features = "nix-command flakes auto-allocate-uids";
       trusted-users = ["root" "servius"];
-      substituters = ["https://sh.darksailor.dev"];
+      #substituters = ["https://sh.darksailor.dev"];
       trusted-public-keys = ["mirai:bcVPoFGBZ0i7JAKMXIqLj2GY3CulLC4kP7rQyqes1RM="];
     };
     extraOptions = ''
@@ -73,6 +73,13 @@
     distributedBuilds = true;
   };
 
+  users.users.servius = {
+    isNormalUser = true;
+    description = "Uttarayan";
+    extraGroups = ["networkmanager" "wheel" "audio" "i2c"];
+  };
+  users.groups.i2c = {};
+
   services = {
     tailscale = {
       enable = true;

nixos/ryu/ryu.nix

@@ -73,12 +73,6 @@
     KERNEL=="i2c-[0-9]*", GROUP="i2c", MODE="0660"
   '';
 
-  users.users.servius = {
-    isNormalUser = true;
-    description = "Uttarayan";
-    extraGroups = ["networkmanager" "wheel" "audio" "i2c"];
-  };
-
   fileSystems."/" = {
     device = "/dev/disk/by-uuid/11d8beef-2a63-4231-af35-b9b8d3a17e9b";
     fsType = "ext4";