Add our own OTP release configuration

mix.exs

@@ -7,7 +7,8 @@ defmodule HAHandler.MixProject do
       version: "0.1.0",
       elixir: "~> 1.12",
       start_permanent: Mix.env() == :prod,
-      deps: deps()
+      deps: deps(),
+      releases: releases()
     ]
   end
 
@@ -28,4 +29,18 @@ defmodule HAHandler.MixProject do
       {:poison, "~> 5.0"}
     ]
   end
+
+  # See https://hexdocs.pm/mix/Mix.Tasks.Release.html for details.
+  defp releases do
+    [
+      ha_handler: [
+        include_executables_for: [:unix],
+        applications: [runtime_tools: :permanent],
+        include_erts: true,
+        config_providers: [
+          {Config.Reader, {:system, "HA_HANDLER_CONFIG_DIR", "config.exs"}}
+        ]
+      ]
+    ]
+  end
 end

rel/env.bat.eex

@@ -1,5 +0,0 @@
-@echo off
-rem Set the release to work across nodes.
-rem RELEASE_DISTRIBUTION must be "sname" (local), "name" (distributed) or "none".
-rem set RELEASE_DISTRIBUTION=name
-rem set RELEASE_NODE=<%= @release.name %>