Add stm32cubemx in dev shell

flake.nix

@@ -5,7 +5,8 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
   };
 
-  outputs = { nixpkgs, ... }:
+  outputs =
+    { nixpkgs, ... }:
     let
       systems = [ "x86_64-linux" ];
     in
@@ -14,9 +15,14 @@
         nixpkgs.config.allowUnfree = true;
       };
 
-        devShells = nixpkgs.lib.genAttrs systems (system:
+      devShells = nixpkgs.lib.genAttrs systems (
+        system:
         let
-            pkgs = nixpkgs.legacyPackages.${system};
+          # pkgs = nixpkgs.legacyPackages.${system};
+          pkgs = import nixpkgs {
+            inherit system;
+            config.allowUnfree = true;
+          };
         in
         {
           default = pkgs.mkShell {
@@ -27,6 +33,7 @@
               pkgs.gdb
               pkgs.openocd
               pkgs.gdbgui
+              pkgs.stm32cubemx
             ];
           };
         }