nixos/draupnir: init

Co-authored-by: emilylange <git@emilylange.de>
Co-authored-by: Martin Weinelt <hexa@darmstadt.ccc.de>
Co-authored-by: teutat3s <10206665+teutat3s@users.noreply.github.com>

nixos/modules/module-list.nix

@@ -757,6 +757,7 @@
   ./services/matrix/conduit.nix
   ./services/matrix/continuwuity.nix
   ./services/matrix/dendrite.nix
+  ./services/matrix/draupnir.nix
   ./services/matrix/hebbot.nix
   ./services/matrix/hookshot.nix
   ./services/matrix/lk-jwt-service.nix