Add flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1755615617,
+        "narHash": "sha256-HMwfAJBdrr8wXAkbGhtcby1zGFvs+StOp19xNsbqdOg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "20075955deac2583bb12f07151c2df830ef346b4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,28 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+  outputs = { self, nixpkgs, ... }: let
+    forAllSystems = f: (nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" ] (system: let
+      pkgs = import nixpkgs { inherit system; };
+    in f { inherit pkgs system; } ));
+  in {
+    packages = forAllSystems ({ pkgs, system, ... }: {
+      flake-tracker = pkgs.rustPlatform.buildRustPackage rec {
+        pname = "flake-tracker";
+        version = "0.1.0";
+
+        src = ./.;
+
+        cargoLock.lockFile = ./Cargo.lock;
+
+      };
+      default = self.packages."${system}".flake-tracker;
+    });
+
+    hydraJobs = {
+      inherit (self)
+        packages;
+    };
+  };
+}