Add nix / direnv setup

.envrc

@@ -0,0 +1 @@
+use_nix

default.nix

@@ -0,0 +1,34 @@
+let
+  unstableTarball = fetchTarball
+    "https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz";
+  pkgs = import <nixpkgs> { };
+  unstable = import unstableTarball { };
+
+in with pkgs;
+pkgs.mkShell rec {
+  name = "rust";
+  buildInputs = [
+    entr
+    openssl
+    pkg-config
+    unstable.cargo
+    unstable.rustc
+    unstable.rustfmt
+    unstable.rust-analyzer
+    postgresql
+    diesel-cli
+  ];
+  # By default setup dev environment.
+  AWS_ACCESS_KEY_ID = "0BO8BCZZXV3SFZ1B43W1";
+  AWS_SECRET_ACCESS_KEY = "x6SjXJZuP1tMzxH/a6xEFDcMw4XB8qCfRPNbuGzN";
+  DATABASE_USER = "comics_devel";
+  DATABASE_NAME = "comics_devel";
+  DATABASE_HOST = "postgres.h.xinu.tv";
+  DATABASE_URL =
+    "postgres://${DATABASE_USER}@${DATABASE_HOST}/${DATABASE_NAME}";
+  PROD_DATABASE_USER = "comics";
+  PROD_DATABASE_NAME = "comics";
+  PROD_DATABASE_HOST = "postgres.h.xinu.tv";
+  PROD_DATABASE_URL =
+    "postgres://${PROD_DATABASE_USER}@${PROD_DATABASE_HOST}/${PROD_DATABASE_NAME}";
+}