Flake update, use goland and rust from stable, add kdenlive for fenix@fenixpc

flake.nix

@@ -4,6 +4,7 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixpkgs-master.url = "github:NixOS/nixpkgs/master";
     home-manager = {
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -30,6 +31,7 @@
       self,
       nixpkgs,
       nixpkgs-stable,
+      nixpkgs-master,
       ...
     }@inputs:
     let
@@ -57,6 +59,12 @@
           inherit system;
           config.allowUnfree = true;
         };
+      pkgsMasterSettings =
+        system:
+        import nixpkgs-master {
+          inherit system;
+          config.allowUnfree = true;
+        };
 
       hosts = import ./hosts.nix;
       hostNames = builtins.attrNames hosts;
@@ -82,6 +90,7 @@
               extraSpecialArgs = {
                 inherit inputs;
                 pkgsStable = pkgsStableSettings pkgs.system;
+                pkgsMaster = pkgsMasterSettings pkgs.system;
                 hosts = hosts;
               };
             };
@@ -107,6 +116,7 @@
             specialArgs = {
               inherit inputs;
               pkgsStable = pkgsStableSettings host.system;
+              pkgsMaster = pkgsMasterSettings host.system;
               hosts = hosts;
               quirks = (quirks: (import ./quirks { inherit quirks; }));
             };