Add warning when you have no database config
user
```ruby
file "config/database.yml.template" do |task|
    abort "I don't know what to tell you, dude. There's no #{task.name}. So maybe you should make one of those, and see where that gets you."
end

file "config/database.yml" => "config/database.yml.template" do |task|
    puts "Dude! I found #{task.prerequisites.first}, so I'll make a copy of it for you."
      cp task.prerequisites.first, task.name
        abort "Make sure it's cromulent to your setup, then rerun the last command."
end

task :environment => "config/database.yml"
```
assistant