Migrate from Heroku shared database to new database plans (dev currently embedded)

migrate.rb

# ruby migrate.rb <app-name>

app = ARGV[0]

require 'heroku'
hc = Heroku::Client.new(ENV['HEROKU_USER'], ENV['HEROKU_PASS'])

response = hc.install_addon(app, 'heroku-postgresql:dev')
puts response
db = response['message'][/HEROKU_POSTGRESQL_\w+/]

puts hc.install_addon(app, 'pgbackups')

hc.maintenance(app, :on)

system("heroku pgbackups:capture --expire --app #{app}")
system("heroku pgbackups:restore #{db} --confirm #{app} --app #{app}")
system("heroku pg:promote #{db} --app #{app}")

hc.maintenance(app, :off)