added devbox, devenv, flox

modules/development/flox.nix

@@ -0,0 +1,17 @@
+{
+  lib,
+  pkgs,
+  inputs,
+  ...
+}:
+
+{
+  nix.settings.trusted-substituters = lib.mkAfter [ "https://cache.flox.dev" ];
+  nix.settings.trusted-public-keys = lib.mkAfter [
+    "flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs="
+  ];
+
+  environment.systemPackages = lib.mkAfter [
+    inputs.flox.packages.${pkgs.system}.flox
+  ];
+}

modules/system/packages.nix

@@ -3,6 +3,8 @@
 {
   # Baseline system tools available everywhere; users run Home Manager standalone.
   config.environment.systemPackages = lib.mkAfter [
+    pkgs.devbox
+    pkgs.devenv
     pkgs.distrobox
     pkgs.distroshelf
     pkgs.dnsmasq