Rakefile in dockerfile-rails-1.6.16 vs Rakefile in dockerfile-rails-1.6.17

@@ -1,6 +1,9 @@
 # frozen_string_literal: true
 
+require "rails"
+Rails.env = "test"
+
 require "bundler/gem_tasks"
 
 # Run `rake release` to release a new version of the gem.
 
 require "rake/testtask"