chore: add flake

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

flake.lock

@@ -0,0 +1,72 @@
+{
+  "nodes": {
+    "lib": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "treefmt-nix": [
+          "treefmt-nix"
+        ]
+      },
+      "locked": {
+        "lastModified": 1758632667,
+        "narHash": "sha256-C0aBPv8vqTI1QNVhygZxL0f49UERx2UejVdtyz67jhs=",
+        "ref": "refs/heads/main",
+        "rev": "5e0737c20f3c265dbff604170a6433cc1e1a4b41",
+        "revCount": 8,
+        "type": "git",
+        "url": "https://git.karaolidis.com/karaolidis/nix-lib.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.karaolidis.com/karaolidis/nix-lib.git"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1760284886,
+        "narHash": "sha256-TK9Kr0BYBQ/1P5kAsnNQhmWWKgmZXwUQr4ZMjCzWf2c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cf3f5c4def3c7b5f1fc012b3d839575dbe552d43",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "lib": "lib",
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1760120816,
+        "narHash": "sha256-gq9rdocpmRZCwLS5vsHozwB6b5nrOBDNc2kkEaTXHfg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "761ae7aff00907b607125b2f57338b74177697ed",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}