how to add `config/database.yml` to shared_path without an error

[jiyarong]

set :shared_dirs, fetch(:shared_dirs, []).push('config')
set :shared_files, fetch(:shared_files, []).push('config/database.yml', 'config/secrets.yml', 'config/application.rb')

when I run mina deploy
I got this error

Creating database
       rake aborted!
       LoadError: cannot load such file -- /var/www/rails_deploy/tmp/build-152151454030208/config/application
       /var/www/rails_deploy/tmp/build-152151454030208/Rakefile:4:in `require_relative'
       /var/www/rails_deploy/tmp/build-152151454030208/Rakefile:4:in `<top (required)>'
       /var/www/rails_deploy/tmp/build-152151454030208/vendor/bundle/ruby/2.3.0/gems/rake-12.3.0/exe/rake:27:in `<top (required)>'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/cli/exec.rb:75:in `load'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/cli/exec.rb:75:in `kernel_load'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/cli/exec.rb:28:in `run'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/cli.rb:424:in `exec'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/cli.rb:27:in `dispatch'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/cli.rb:18:in `start'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/exe/bundle:30:in `block in <top (required)>'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/lib/bundler/friendly_errors.rb:122:in `with_friendly_errors'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/gems/bundler-1.16.1/exe/bundle:22:in `<top (required)>'
       /home/ubuntu/.rvm/gems/ruby-2.3.1/bin/bundle:23:in `load'

and this is my deploy.rb

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

# require_relative "deploy/sidekiq"
# require_relative "deploy_extension/mina_unicorn"
# require_relative "deploy/dbconsole"

# Basic settings:
#   domain       - The hostname to SSH to.
#   deploy_to    - Path to deploy into.
#   repository   - Git repo to clone from. (needed by mina/git)
#   branch       - Branch name to deploy. (needed by mina/git)

set :application_name, 'rails_deploy'
set :domain, 'ubuntu@u1c2g'
set :deploy_to, '/var/www/rails_deploy'
set :repository, 'https://github.com/jiyarong/rails-deploy.git'
set :branch, 'master'

set :shared_dirs, fetch(:shared_dirs, []).push('config')
set :shared_files, fetch(:shared_files, []).push('config/database.yml', 'config/secrets.yml', 'config/application.rb')
ruby_version = "2.3.1"

# Optional settings:
#   set :user, 'foobar'          # Username in the server to SSH to.
#   set :port, '30000'           # SSH port number.
#   set :forward_agent, true     # SSH forward_agent.

# Shared dirs and files will be symlinked into the app-folder by the 'deploy:link_shared_paths' step.
# Some plugins already add folders to shared_dirs like `mina/rails` add `public/assets`, `vendor/bundle` and many more
# run `mina -d` to see all folders and files already included in `shared_dirs` and `shared_files`

# This task is the environment that is loaded for all remote run commands, such as
# `mina deploy` or `mina rake`.
task :remote_environment do
  invoke :"rvm:use", ruby_version
  # If you're using rbenv, use this to load the rbenv environment.
  # Be sure to commit your .ruby-version or .rbenv-version to your repository.
  # invoke :'rbenv:load'

  # For those using RVM, use this to load an RVM version@gemset.
  # invoke :'rvm:use', 'ruby-1.9.3-p125@default'
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 => :remote_environment do
  # %w/database.yml secrets.yml/.each do |config_file|
  #   command %{touch "#{fetch(:deploy_to)}/shared/config/#{config_file}"}
  # end
end

desc "Deploys the current version to the server."
task :deploy do
  # uncomment this line to make sure you pushed your local branch to the remote origin
  # invoke :'git:ensure_pushed'
  deploy do
    # Put things that will set up an empty directory into a fully set-up
    # instance of your project.
    invoke :'git:clone'
    invoke :'deploy:link_shared_paths'
    invoke :'bundle:install'
    invoke :'rails:db_create'
    invoke :'rails:db_migrate'
    invoke :'rails:assets_precompile'
    invoke :'deploy:cleanup'

    on :launch do
      in_path(fetch(:current_path)) do
        command %{mkdir -p tmp/}
        command %{touch tmp/restart.txt}
      end
    end
  end

  # you can use `run :local` to run tasks on local machine before of after the deploy scripts
  # run(:local){ say 'done' }
end

[Giorgos Velissaris]

I think the message here is that application.rb is missing ?