Add flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1729665710,
+        "narHash": "sha256-AlcmCXJZPIlO5dmFzV3V2XF6x/OpNWUV8Y/FMPGd8Z4=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2768c7d042a37de65bb1b5b3268fc987e534c49d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,17 @@
+{
+  description = "Development environment flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }: nixpkgs.lib.foldAttrs (item: acc: item // acc) { } (map
+    (system: with nixpkgs.legacyPackages."${system}"; {
+      devShells."${system}".default = mkShell {
+        nativeBuildInputs = [
+          nodejs_20
+          tmux
+        ];
+      };
+    }) [ "x86_64-linux" "aarch64-linux" ]);
+}