feat(backend): janky (broken) cross compile/build setup using nix

flake.nix

@@ -39,6 +39,32 @@
             WorkingDir = "/state";
           };
         };
+
+        cross = flake-utils.lib.eachDefaultSystem (crossSystem:
+          let
+            pkgs = import nixpkgs {
+              localSystem = system;
+              inherit crossSystem;
+            };
+          in
+        {
+          default = pkgs.python311Packages.buildPythonApplication {
+            pname = "aci-backend";
+            inherit version;
+            propagatedBuildInputs = dependencies pkgs.python311Packages;
+            src = ./backend;
+          };
+        
+          docker = pkgs.dockerTools.buildLayeredImage {
+            name = self.packages.${system}.cross.default.${crossSystem}.pname;
+            tag = "latest";
+            contents = [ self.packages.${system}.cross.default.${crossSystem} pkgs.busybox ];
+            config = {
+              Cmd = [ "/bin/app.py" ];
+              WorkingDir = "/state";
+            };
+          };
+        });
       };
       devShells.default = pkgs.mkShell {
         nativeBuildInputs = with pkgs; [