pinwheel: Add gleam module

hosts/pinwheel/modules/gleam/default.nix

@@ -0,0 +1,25 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}:
+let
+  enabled = config.mod.gleam.enable;
+in
+{
+  options = {
+    mod.gleam = {
+      enable = lib.mkEnableOption "enable gleam module";
+    };
+  };
+
+  config = lib.mkIf enabled {
+    home-manager.users.alex = {
+      home.packages = [
+        pkgs.gleam
+        pkgs.erlang
+      ];
+    };
+  };
+}