feat: create nix flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1708566995,
+        "narHash": "sha256-e/THimsoxxMAHSbwMKov5f5Yg+utTj6XVGEo24Lhx+0=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "3cb4ae6689d2aa3f363516234572613b31212b78",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-23.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "comfycamp.space";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-23.11";
+  };
+
+  outputs = { self, nixpkgs }:
+  let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in
+  {
+    devShells.${system}.default = pkgs.mkShell {
+      buildInputs = [
+        pkgs.nodejs_20
+        pkgs.imagemagick
+      ];
+    };
+  };
+}