Add nix-your-shell so I can use fish in nix shells

nixos/configuration.nix

@@ -7,6 +7,7 @@
   pkgs,
   unstable,
   inputs,
+  nix-your-shell,
   ...
 }:
 
@@ -15,6 +16,10 @@
 # in
 
 {
+  nixpkgs.overlays = [
+    nix-your-shell.overlays.default
+  ];
+
   nix.settings.experimental-features = [
     "nix-command"
     "flakes"
@@ -143,7 +148,13 @@
 
   programs.firefox.enable = true;
   programs.thunderbird.enable = true;
-  programs.fish.enable = true;
+  programs.fish = {
+    enable = true;
+    interactiveShellInit = ''
+      nix-your-shell fish | source
+    '';
+  };
+
 
   programs.gpu-screen-recorder = {
     enable = true;

nixos/flake.nix

@@ -10,12 +10,19 @@
 
     # CPU microcode updater
     ucodenix.url = "github:e-tho/ucodenix";
+
+    nix-your-shell = {
+      url = "github:MercuryTechnologies/nix-your-shell";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
   };
 
   outputs =
     {
       nixpkgs,
       unstable,
+      nix-your-shell,
       ...
     }@inputs:
     let
@@ -35,6 +42,8 @@
             inherit system;
             config.allowUnfree = true;
           };
+
+          inherit nix-your-shell;
         };
         modules = [
           ./configuration.nix