mina nginx server restart

deploy.rb

#There is a plugin called mina-nginx which is overkill all I am trying to do is restart my nginx after I deploy my sinatra app.  I have this code

require 'mina/rails'
require 'mina/git'
# require 'mina/rbenv'  # for rbenv support. (https://rbenv.org)
require 'mina/rvm'    # for rvm support. (https://rvm.io)

set :domain, 'dot'
set :deploy_to, 'foo'
set :repository, 'bar'
#set :repository, 'biz'
set :branch, 'master'

set :forward_agent, true     # SSH forward_agent.


# This task is the environment that is loaded for all remote run commands, such as
# `mina deploy` or `mina rake`.
task :environment do
  invoke :'rvm:use', 'ruby-2.3.1'
end

# Put any custom commands you need to run at setup
# All paths in `shared_dirs` and `shared_paths` will be created on their own.
task :setup do
  command %{ gem install bundler }
  # command %{rbenv install 2.3.0}
end

desc "Deploys the current version to the server."
task :deploy do
  deploy do
    # Put things that will set up an empty directory into a fully set-up
    # instance of your project.
    invoke :'git:clone'
    invoke :'bundle:install'
    invoke :'deploy:cleanup'
    invoke :restart

  end

end

task :restart do
 comment "Restarting Nginx Server"
 command "sudo service nginx restart"

end
```

#Now every time I try to run my restart command it doesn't work. It hangs on the sudo service nginx restart because it's waiting for a #password to be entered by why do I need a password if I am using ssh forwarding?