add whacamole configuration [fixes SCI-1683]

Gemfile

@@ -88,6 +88,7 @@ end
 group :production do
   gem 'puma'
   gem 'rails_12factor'
+  gem 'whacamole'
 end
 
 group :test do

Gemfile.lock

@@ -339,6 +339,7 @@ GEM
     unicode-display_width (1.2.1)
     warden (1.2.6)
       rack (>= 1.0)
+    whacamole (1.2.0)
     wicked_pdf (1.0.3)
     wkhtmltopdf-heroku (2.12.3.0)
     yomu (0.2.4)
@@ -421,6 +422,7 @@ DEPENDENCIES
   tzinfo-data
   uglifier (>= 1.3.0)
   underscore-rails
+  whacamole
   wicked_pdf
   wkhtmltopdf-heroku
   yomu

Procfile

@@ -1,2 +1,3 @@
 web: bundle exec puma -C config/puma.rb
 worker: bundle exec rake jobs:work
+whacamole: bundle exec whacamole -c ./config/whacamole.rb

config/whacamole.rb

@@ -0,0 +1,14 @@
+# https://github.com/arches/whacamole
+#
+# Steps to setup this on your heroku instance, this will affect only the worker
+#
+# 1) set the env variables (api token: > heroku auth:token)
+# 2) > heroku labs:enable log-runtime-metrics --app YOUR_APP_NAME
+# 3) > heroku ps:scale whacamole=1 --app YOUR_APP_NAME
+
+Whacamole.configure(ENV['HEROKU_APP_NAME']) do |config|
+  config.api_token = ENV['HEROKU_API_TOKEN']
+  config.dynos = %w{worker}
+  config.restart_threshold = ENV['WHACAMOLE_DYNO_RESTART_THRESHOLD'].to_i
+  config.restart_window = ENV['WHACAMOLE_DYNO_RESTART_TIME_IN_SEC'].to_i
+end