build(flake.nix/inputs): Unify systems input for terranix

Author: PetarKirov

flake.lock

@@ -171,6 +171,7 @@
       inputs = {
         nixpkgs.follows = "nixpkgs";
         flake-parts.follows = "flake-parts";
+        systems.follows = "systems";
       };
     };