Add a db:check task

[WengerK]

To ensure the Database is reachable before some commands (such as setuping a new Drupal instance).

  namespace :db do
    desc "Ensure the Database is reachable"
    task :check do
      on roles(:app) do
        within release_path.join(fetch(:app_path)) do
          output = capture(:drush, "status")
          dbstatus = false

          output.each_line do |line|
            if line.include?("Database") && line.include?("Connected")
              dbstatus = true
            end
          end

          if dbstatus == false
            sqlconnect = capture(:drush, "sql:connect")
            raise "The Database seems not reachable. Be sure the following SQL connection is valid '#{sqlconnect}'."
          end
        end
      end
    end