flake.nix: provide other systems too

flake.nix

@@ -7,8 +7,15 @@
 
   outputs = { self, naersk, nixpkgs, rust-overlay }:
     let
-      system = "x86_64-linux";
+      systems = [
+        "aarch64-linux"
+        "i686-linux"
+        "x86_64-linux"
+      ];
       overlays = [ (import rust-overlay) ];
+    in
+      builtins.foldl' (outputs: system:
+        let
           pkgs = import nixpkgs {
             inherit overlays system;
           };
@@ -36,7 +43,7 @@
             vulkan-headers
           ];
         in
-    {
+          nixpkgs.lib.recursiveUpdate outputs {
             packages.${system}.bevy_mandelbrot = naersk-lib.buildPackage {
               pname = "bevy_mandelbrot";
               root = ./.;
@@ -48,12 +55,14 @@
                     --prefix LD_LIBRARY_PATH : ${pkgs.lib.makeLibraryPath runtime-deps} \
                     --set CARGO_MANIFEST_DIR $out/share/bevy_mandelbrot
                   mkdir -p $out/share/bevy_mandelbrot
-            cp -a assets $out/share/bevy_mandelbrot'';
+                  cp -a assets $out/share/bevy_mandelbrot
+                '';
               };
             };
             defaultPackage.${system} = self.packages.${system}.bevy_mandelbrot;
 
             hydraJobs = builtins.mapAttrs (_: drv: { "${system}" = nixpkgs.lib.hydraJob drv; })
               self.packages.${system};
-    };
+          }
+      ) {} systems;
 }