turbo: install from unstable

flake.nix

@@ -3,6 +3,7 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
+    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
     flake-compat.url = "github:nix-community/flake-compat";
     nixos-hardware.url = "github:NixOS/nixos-hardware/master";
@@ -75,6 +76,7 @@
   outputs = {
     self,
     nixpkgs,
+    nixpkgs-unstable,
     agenix,
     deploy-rs,
     flake-utils,
@@ -101,8 +103,8 @@
           deploy-rs = super.deploy-rs-pkg;
           inherit (super.deploy-rs) lib;
         };
+        deploy-rs-pkg = null;
       })
-      (_: _: {deploy-rs-pkg = null;})
       (_: super: {
         inherit (super.callPackage ./pkgs/compress-drv.nix {}) compressDrvWeb;
 
@@ -112,8 +114,11 @@
 
         # TODO: copied from 24.05
         turbo = super.callPackage ./pkgs/turbo.nix {};
-      })
-      (_: _: {
+
+        nixpkgs-unstable = import nixpkgs-unstable {
+          inherit (super) system;
+        };
+
         crossArm64 = import nixpkgs {
           system = "x86_64-linux";
           hostPlatform.config = "aarch64-linux";