Add support for having a local gemfile

Author: adamruzicka

.gitignore

@@ -7,4 +7,5 @@ Gemfile.lock
 .idea
 .ruby-version
 examples/remote_executor_db.sqlite
+/Gemfile.local.rb
 /test.log

Gemfile

@@ -39,3 +39,6 @@ end
 group :telemetry do
   gem 'statsd-instrument'
 end
+
+local_gemfile = File.join(File.dirname(__FILE__), 'Gemfile.local.rb')
+self.instance_eval(Bundler.read_file(local_gemfile)) if File.exist?(local_gemfile)