feat(grfn/system): Add an ocaml home module

Change-Id: Ie61b506751e3829f101fac5d1da4173c8f349f0f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10708
Tested-by: BuildkiteCI
Reviewed-by: aspen <root@gws.fyi>
Autosubmit: aspen <root@gws.fyi>

users/grfn/system/home/modules/development/ocaml.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+{
+  home.packages = with pkgs; [
+    ocaml
+
+    # ocamlPackages.merlin
+    # ocamlPackages.utop
+    # ocamlPackages.ocp-indent
+    # ocamlPackages.ocamlformat
+  ];
+
+  programs.opam = {
+    enable = true;
+    enableZshIntegration = true;
+  };
+}