Don't verify TLS

This is needed when running a Heroku Redis instance other than mini
where you are only given a rediss:// URL and self signed certificate.

This turns off verification of the certificate.

Sidekiq fails to run without this [1].

This is a quick proof of concept so I can link to this branch for a
heroku example.

[1]: https://github.com/sidekiq/sidekiq/wiki/Heroku#redis

lib/govuk_sidekiq/railtie.rb

@@ -5,7 +5,7 @@ class Railtie < Rails::Railtie
     initializer "govuk_sidekiq.initialize_sidekiq" do |app|
       SidekiqInitializer.setup_sidekiq(
         ENV.fetch("GOVUK_APP_NAME", app.root.basename.to_s),
-        { url: ENV.fetch("REDIS_URL", "redis://127.0.0.1:6379") },
+        { url: ENV.fetch("REDIS_URL", "redis://127.0.0.1:6379"), ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE } },
       )
     end
   end