Upgrade to Rails 6.0 and apply new framework defaults

config/initializers/docker.rb

@@ -1,8 +1,5 @@
+# frozen_string_literal: true
+
+require 'docker_client'
+
 DockerClient.initialize_environment unless Rails.env.test? && `which docker`.blank?
-
-return if Rake.application.top_level_tasks.to_s.include?('db:')
-
-if ApplicationRecord.connection.tables.present? &&
-    DockerContainerPool.config[:active]
-  # no op
-end