我试图与Mina一起部署。我对数据库迁移感到困惑，因为它说数据库不存在。
Your bundle is complete!
Gems in the groups development and test were not installed.
It was installed into ./vendor/bundle
-----> Migrating database
rake aborted!
ActiveRecord::NoDatabaseError: FATAL: database "production" does not exist
Run `$ bin/rake db:create db:migrate` to create your database
如何使用mina或ssh创建数据库？我在digitalocean上使用ubuntu 14.04