add flake

flake.lock

@@ -0,0 +1,24 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1690630041,
+        "narHash": "sha256-gbnvqm5goS9DSKAqGFpq3398aOpwejmq4qWikqmQyRo=",
+        "path": "/nix/store/qxgp86sdhxwzj0k89kz2aaw0xw7d8f6i-source",
+        "rev": "d57e8c535d4cbb07f441c30988ce52eec69db7a8",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,12 @@
+{
+  description = "My website";
+
+  outputs = { self, nixpkgs }:
+      {
+        devShells.x86_64-linux.default = import ./shell.nix {
+          pkgs = nixpkgs.legacyPackages."x86_64-linux";
+        };
+
+        defaultPackage.x86_64-linux = self.devShells.x86_64-linux.default;
+      };
+}

shell.nix

@@ -1,4 +1,5 @@
-with import <nixpkgs> {}; let
+{ pkgs, ... }:
+with pkgs; let
 
   json-minify = (buildRubyGem {
     gemName = "json-minify";