rename private stuff

roles/private.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+let
+  unstable = import <nixos-unstable> {};
+in {
+  environment.systemPackages = with pkgs; [
+    arduino
+    avrdude
+    pkgsCross.avr.avrlibc
+    pkgsCross.avr.libcCross
+    pkgsCross.avr.buildPackages.gcc8
+    pkgsCross.avr.buildPackages.binutils
+    unstable.cura
+    openscad
+    kicad
+  ];
+}