feat: split off outputs

overlays/default.nix

@@ -1,5 +1,5 @@
 # This file defines overlays
-{inputs, ...}: {
+{inArgs, ...}: {
   # This one brings our custom packages from the 'pkgs' directory
   additions = final: _prev: import ../pkgs final.pkgs;
 
@@ -15,7 +15,7 @@
   # When applied, the unstable nixpkgs set (declared in the flake inputs) will
   # be accessible through 'pkgs.unstable'
   unstable-packages = final: _prev: {
-    unstable = import inputs.nixos-unstable {
+    unstable = import inArgs.nixos-unstable {
       system = final.system;
       config.allowUnfree = true;
     };