require 'rails' before initialize config

[highwide]

In order to fix this👇 (I guess it's been since #191 )

config/shoryuken.yml

queues:
  - [<%= Rails.env %>-foo-bar-queue, 2]

% bundle exec shoryuken -R -C config/shoryuken.yml
uninitialized constant Rails
...

[phstc]

Hi @highwide

I was wondering if we should - [<%= ENV['RAILS_ENV'] %>-foo-bar-queue, 2] instead. Sidekiq only requires Rails, after loading the config files: https://github.com/mperham/sidekiq/blob/78fc103d561792b876854706f0e8acdc3b3379f4/lib/sidekiq/cli.rb#L222

I'm not sure if there's a specific reason for that.

[highwide]

Thank you @phstc

It's a pity but I understood that I can't use like <%= Rails.env.production? ? '': "#{Rails.env}-" %>
I'll use RAILS_ENV and close this PR.