docs(tvix/boot): document we could use a smaller kernel here.

We currently use a pretty big kernel to boot the tvix VMs, with a lot
of drivers.

It can probably be slimmed down significantly, at least on the hardware
driver and filesystem front.

Change-Id: I4c7f73fb2dafbf2bcdec8057d2b14a9b0e9b3275
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11187
Tested-by: BuildkiteCI
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Autosubmit: flokli <flokli@flokli.de>

tvix/boot/default.nix

@@ -11,6 +11,8 @@ rec {
   };
 
   # A kernel with virtiofs support baked in
+  # TODO: make a smaller kernel, we don't need a gazillion filesystems and
+  # device drivers in it.
   kernel = pkgs.buildLinux ({ } // {
     inherit (pkgs.linuxPackages_latest.kernel) src version modDirVersion;
     autoModules = false;