Recommended style to cross-compile flake nixosSystems

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Okay I could do:

        {
          # This is the architecture we build from (pkgs.system from above)
          nixpkgs.buildPlatform = builtins.currentSystem;
          # pkgsCross.<yourtarget>.system
          nixpkgs.hostPlatform = "aarch64-linux";
        }

but you have to pass --impure but i’m not sure otherwise how to make a nixosConfiguration that I can either build on my laptop or on my raspberry pi. I feel like I’m missin gsomething.

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