Add .profile.d script and remove config vars from bin/release

Author: HashNuke

.profile.d/config_vars.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+export PLATFORM=heroku
+export PATH=$PATH:/app/erlang/bin:/app/elixir/bin
+export MIX_ENV=${MIX_ENV:-prod}

bin/release

@@ -6,8 +6,4 @@ addons:
   heroku-postgresql:hobby-dev
 default_process_types:
   web: mix server -p \$PORT
-config_vars:
-  PLATFORM: heroku
-  PATH: /app/erlang/bin:/app/elixir/bin:bin:/usr/bin:/bin
-  MIX_ENV: prod
 EOF