Ember app is precompiled but a blank page is served

[devtoro]

Which operating system and version is the project developed on?
ubuntu 16.04
Which version of ruby is the project developed on?
2.3.3
Which version of npm is the project developed on?
4.2.0
Which version of ember-cli is the project developed on?
2.10.0
What is the rails version?
5.0.0.1 -- rails-api
What is the ember-cli-rails version (from Gemfile)?
0.8.4
What is the ember-cli-rails-addon version (from package.json)?
^ 0.8.0
Is your application server multi-threaded
(such as puma and unicorn) or is it multi-process (such as thin and webrick)?
I am using puma
What are the contents of config/initializers/ember.rb?
EmberCli.configure do |c|
c.app :frontend, path: "/home/user/apps/app-name"
end
What are the contents of the Rails' view that renders the Ember application?
I haven't created any views in my rails-api application.
How are the EmberCLI-related routes defined?
mount_ember_app :frontend, to: "/"

How is the application deployed?
With capistrano

The deploy is finished successfully. Assets are precompiled and puma starts. When I try to visit my page all I can see is a blank page.