Wercker.yml that generated a config/database.yml for rails

wercker.yml

box: wercker/ruby
services:
  - wercker/postgresql9.2
build:
  steps:
    - create-file:
        filename: config/database.yml
        content: |-
          adapter: postgresql
          encoding: utf8
          database: <%= ENV['WERCKER_POSTGRESQL_DATABASE'] %>
          username: <%= ENV['WERCKER_POSTGRESQL_USERNAME'] %>
          password: <%= ENV['WERCKER_POSTGRESQL_PASSWORD'] %>
          host: <%= ENV['WERCKER_POSTGRESQL_HOST'] %>