Capistrano: Install capistrano-passenger

Our Rails deployments are run by passenger on the application servers, to automatically restart passenger workers after a deploy you should include the capistrano-passenger Show archive.org snapshot Gem in your Gemfile by adding this line:

gem 'capistrano-passenger', require: false

And install it by calling bundle:

$ bundle

To actually be able to use the tasks this Gem provides you have to also require it in your Capfile like this:

# Include passenger tasks
# This automatically sets up deploy:restart to run after :publishing is complete
require 'capistrano/passenger'

As the comment says, just the presence of this line automatically calls deploy:restart and will restart your passenger workers after the :publishing task was successful.