Move server configs into a reusable module

modules/common.nix

@@ -1,9 +1,16 @@
-{ pkgs, ... }:
+{ pkgs, secrets, ... }:
 {
   nixpkgs.config.allowUnfree = true;
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
+  users.users.nettika = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" "networkmanager" ];
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
   programs.git = {
     enable = true;
     lfs.enable = true;
@@ -16,7 +23,7 @@
       credential.helper = "store";
     };
   };
-  
+
   programs.nano = {
     enable = true;
     nanorc = ''
@@ -24,6 +31,11 @@
       set linenumbers
     '';
   };
-  
+
+  services.zerotierone = {
+    enable = true;
+    joinNetworks = secrets.zerotier.networks;
+  };
+
   environment.systemPackages = [ pkgs.git-crypt ];
 }