Yep! Following patch works well:

From adebf8561a99b5cd2054e2d97c16e28aff078147 Mon Sep 17 00:00:00 2001
From: Tute Costa <tutecosta@gmail.com>
Date: Thu, 30 Jun 2016 12:18:52 -0400
Subject: [PATCH] Add Envy for environment variables

---
 .sample.env     | 3 +++
 lib/app_name.ex | 5 +++++
 mix.exs         | 1 +
 mix.lock        | 1 +
 4 files changed, 10 insertions(+)
 create mode 100644 .sample.env

diff --git a/.sample.env b/.sample.env
new file mode 100644
index 0000000..707fbf9
--- /dev/null
+++ b/.sample.env
@@ -0,0 +1,3 @@
+AWS_ACCESS_KEY_ID=abcd
+AWS_SECRET_ACCESS_KEY=abcd
+AWS_S3_BUCKET=abcd
diff --git a/lib/app_name.ex b/lib/app_name.ex
index f2b6334..5899679 100644
--- a/lib/app_name.ex
+++ b/lib/app_name.ex
@@ -6,6 +6,11 @@ defmodule AppName do
   def start(_type, _args) do
     import Supervisor.Spec, warn: false

+    unless Mix.env == :prod do
+      Envy.auto_load
+      Mix.Config.read!("config/config.exs") |> Mix.Config.persist
+    end
+
     children = [
       # Start the endpoint when the application starts
       supervisor(AppName.Endpoint, []),
diff --git a/mix.exs b/mix.exs
index 8f2feb2..98f8472 100644
--- a/mix.exs
+++ b/mix.exs
@@ -46,6 +46,7 @@ defmodule AppName.Mixfile do
       {:arc, "~> 0.5.2"},
       {:comeonin, "~> 2.4"},
       {:cowboy, "~> 1.0"},
+      {:envy, "~> 0.0.2"},
       {:ex_aws, "~> 0.4.10"},
       {:ex_machina, "~> 1.0.0-beta.1", github: "thoughtbot/ex_machina"},
       {:floki, "~> 0.8.1"},
diff --git a/mix.lock b/mix.lock
index bb52130..ef01aad 100644
--- a/mix.lock
+++ b/mix.lock
@@ -7,6 +7,7 @@
   "db_connection": {:hex, :db_connection, "0.2.5", "3e5e28019e0ec744345568d22a2f5206109bff0e2571f4d7819e0d14cf955f3e", [:mix], [{:sbroker, "~> 0.7", [hex: :sbroker, optional: true]}, {:poolboy, "~> 1.5", [hex: :poolboy, optional: true]}, {:connection, "~> 1.0.2", [hex: :connection, optional: false]}]},
   "decimal": {:hex, :decimal, "1.1.2", "79a769d4657b2d537b51ef3c02d29ab7141d2b486b516c109642d453ee08e00c", [:mix], []},
   "ecto": {:hex, :ecto, "2.0.0-rc.5", "a95184a260edb89669be7746b3b270725ce6940e378b05d19df82eecf52544cb", [:mix], [{:sbroker, "~> 0.7", [hex: :sbroker, optional: true]}, {:postgrex, "~> 0.11.1", [hex: :postgrex, optional: true]}, {:poolboy, "~> 1.5", [hex: :poolboy, optional: false]}, {:poison, "~> 1.5 or ~> 2.0", [hex: :poison, optional: true]}, {:mariaex, "~> 0.7.1", [hex: :mariaex, optional: true]}, {:decimal, "~> 1.0", [hex: :decimal, optional: false]}]},
+  "envy": {:hex, :envy, "0.0.2", "278045cf7a7c7d46bd607e9cd6632b7d3fc71ddaa9c26bf364ec11af961b313b", [:mix], []},
   "ex_aws": {:hex, :ex_aws, "0.4.19", "84284a2ce936b1aed3d6db4dac4ccf28105f2b617201194b2804d737cd0ef818", [:mix], [{:jsx, "~> 2.5", [hex: :jsx, optional: true]}, {:httpotion, "~> 2.0", [hex: :httpotion, optional: true]}, {:poison, "~> 1.2 or ~> 2.0", [hex: :poison, optional: true]}, {:httpoison, "~> 0.8", [hex: :httpoison, optional: true]}, {:sweet_xml, "~> 0.5", [hex: :sweet_xml, optional: true]}]},
   "ex_machina": {:git, "https://github.com/thoughtbot/ex_machina.git", "a24c02618b460094bb81ea90f41e052355383e5a", []},
   "floki": {:hex, :floki, "0.8.1", "06aa75bf2d1e01cda7d2ad54f68614be653a11e76b474d8fcb1d838f8c1e0ad1", [:mix], [{:mochiweb_html, "~> 2.15", [hex: :mochiweb_html, optional: false]}]},
--
2.8.1

Thank you Blake!

Read environment variables in config/config.exs #4

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