add flake config

devbox.json

@@ -1,6 +0,0 @@
-{
-  "packages": [],
-  "shell": {
-    "init_hook": null
-  }
-}

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669867399,
+        "narHash": "sha256-Z8RXSFYOsIsTG96ROKtV0eZ8Q7u4irFWm6ELqfw7mT8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "38e591dd05ffc8bdf79dc752ba78b05e370416fa",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,19 @@
+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      pkgs = import nixpkgs { system = "x86_64-linux"; };
+    in
+    {
+      devShells.x86_64-linux.default = pkgs.mkShell {
+        packages = with pkgs; [
+          php82Packages.composer
+          nixos-shell
+          nodejs
+          # phpunit
+        ];
+      };
+    };
+}
+