Rakefile in invoker-1.4.1 vs Rakefile in invoker-1.5.1

@@ -3,5 +3,13 @@
 
 RSpec::Core::RakeTask.new
 
 task :default => :spec
 task :test => :spec
+
+current_directory = File.expand_path(File.dirname(__FILE__))
+
+desc "run specs inside docker"
+task :docker_spec do
+  system("docker build -t invoker-ruby . ")
+  system("docker run --name invoker-rspec --rm -v #{current_directory}:/invoker -t invoker-ruby")
+end