simple yaml+erb

config.yaml.erb

production:
  name: <%= name %>
  password: <%= password %>

go.rb

require 'yaml'
require 'erb'


def go
  name = 'hihihi'
  password = 'mypassword'

  yml = ERB.new(File.read('config.yaml.erb')).result(binding)

  puts YAML.load(yml).inspect
end

go()