Added initial setup for direnv

This won't be useful for most people, but for anyone using direnv this will
give you a basic development environment for Ghost, if you so desire.

.envrc

@@ -0,0 +1,2 @@
+layout node
+use flake .

.gitignore

@@ -66,6 +66,9 @@ typings/
 # dotenv environment variables file
 .env
 
+# direnv
+.direnv
+
 # IDE
 .idea/*
 *.iml

flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1708501555,
+        "narHash": "sha256-zJaF0RkdIPbh8LTmnpW/E7tZYpqIE+MePzlWwUNob4c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b50a77c03d640716296021ad58950b1bb0345799",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,49 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+  };
+
+  outputs = {
+    systems,
+    nixpkgs,
+    ...
+  } @ inputs: let
+    yarn_overlay = final: prev: {
+        yarn = prev.yarn.overrideAttrs(finalAttrs: prevAttrs: {
+            # This is to make sure that yarn runs the correct node version
+            # https://github.com/NixOS/nixpkgs/issues/145634#issuecomment-1627476963
+            installPhase = prevAttrs.installPhase + ''
+                ln -fs $out/libexec/yarn/bin/yarn $out/bin/yarn
+                ln -fs $out/libexec/yarn/bin/yarn.js $out/bin/yarn.js
+                ln -fs $out/libexec/yarn/bin/yarn $out/bin/yarnpkg
+            '';
+        });
+    };
+
+    # This gives us a central place to set the node version
+    node_overlay = final: prev: {
+        nodejs = prev.nodejs-18_x;
+    };
+
+    eachSystem = f:
+      nixpkgs.lib.genAttrs (import systems) (
+        system:
+          f ((nixpkgs.legacyPackages.${system}.extend yarn_overlay).extend node_overlay)
+      );
+  in {
+
+    devShells = eachSystem (pkgs: {
+      default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+            nodejs
+            yarn
+        ];
+
+        shellHook = ''
+            echo "node `${pkgs.nodejs}/bin/node --version`"
+        '';
+      };
+    });
+  };
+}