add flake support

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1741865919,
+        "narHash": "sha256-4thdbnP6dlbdq+qZWTsm4ffAwoS8Tiq1YResB+RP6WE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "573c650e8a14b2faa0041645ab18aed7e60f0c9a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "osbm.dev astro website";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  outputs = { nixpkgs, ...}:
+    let
+      system = "x86_64-linux";
+      pkgs = import nixpkgs { inherit system; };
+    in
+    {
+      defaultPackage.x86_64-linux = pkgs.stdenv.mkDerivation {
+        name = "osbm.dev";
+        src = ./.;
+        buildInputs = [ pkgs.nodejs ];
+        installPhase = ''
+          mkdir -p $out
+          cp -r * $out
+        '';
+      };
+    };
+
+}