adding a flake.nix file to build this shell with nix

flake.nix

@@ -0,0 +1,35 @@
+{
+  description = "Desktop shell for Caelestia dots";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    systems.url = "github:nix-systems/default";
+
+    quickshell = {
+      url = "git+https://git.outfoxxed.me/outfoxxed/quickshell";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    systems,
+    ...
+  } @ inputs: let
+    eachSystem = nixpkgs.lib.genAttrs (import systems);
+  in {
+    formatter = eachSystem (pkgs: pkgs.alejandra);
+
+    packages = eachSystem (system: rec {
+      noctalia-shell = nixpkgs.legacyPackages.${system}.callPackage ./nix {
+        rev = self.rev or self.dirtyRev;
+        quickshell = inputs.quickshell.packages.${system}.default.override {
+          withX11 = false;
+          withI3 = false;
+        };
+      };
+      default = noctalia-shell;
+    });
+  };
+}