Deploying SampleApp to Dokku.

sample_app_deploy.sh

# [Dokku - The smallest PaaS implementation you've ever seen](http://dokku.viewdocs.io/dokku/deployment/application-deployment/#deploying-to-dokku)
# login root user.

dokku apps:create ruby-rails-sample

# install the postgres plugin
# plugin installation requires root, hence the user change
dokku plugin:install https://github.com/dokku/dokku-postgres.git

# create a postgres service with the name rails-database
dokku postgres:create rails-database

# each official datastore offers a `link` method to link a service to any application
dokku postgres:link rails-database ruby-rails-sample