add devenv to blarog

systems/modules/devenv.nix

@@ -0,0 +1,10 @@
+
+{ config, pkgsUnstable, ... } :
+
+{
+  environment.systemPackages = with pkgsUnstable; [
+    devenv
+  ];
+
+  nix.settings.trusted-users = [ "root" "avravels" ];
+}