Add all of iogamaster modules

modules/nixos/system/security/doas/default.nix

@@ -0,0 +1,34 @@
+{
+  options,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with lib.frajul; let
+  cfg = config.system.security.doas;
+in {
+  options.system.security.doas = {
+    enable = mkBoolOpt false "Whether or not to replace sudo with doas.";
+  };
+
+  config = mkIf cfg.enable {
+    # Disable sudo
+    security.sudo.enable = false;
+
+    # Enable and configure `doas`.
+    security.doas = {
+      enable = true;
+      extraRules = [
+        {
+          users = [config.user.name];
+          noPass = true;
+          keepEnv = true;
+        }
+      ];
+    };
+
+    # Add an alias to the shell for backward-compat and convenience.
+    environment.shellAliases = {sudo = "doas";};
+  };
+}