Add nix env

.envrc

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+use flake

flake.nix

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+{
+  description = "Nix-flake Elixir development environment for Eltx";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        inherit (pkgs.lib) optional optionals;
+        pkgs = import nixpkgs { inherit system; };
+
+        elixir = pkgs.beam.packages.erlang.elixir;
+      in
+      with pkgs;
+      {
+        devShell = pkgs.mkShell {
+          buildInputs = [
+            bashInteractive
+            elixir
+            elixir_ls
+            nodejs
+            glibcLocales
+            #flyctl
+          ] ++ optional stdenv.isLinux inotify-tools
+          ++ optional stdenv.isDarwin terminal-notifier
+          ++ optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
+            CoreFoundation
+            CoreServices
+          ]);
+        };
+      });
+}