clear_archived_data

Open your terminal, cd to some any folder then

fastlane new_plugin [plugin_name]

Fastlane will create the directory and the folders you need.

Then navigate to lib -> fastlane -> plugin_name.rb edit and add your action here.

Add created directory to your github as a public.

First you need to have an acoount on RubyGems.org

Update spec.homepage to show your github plugin url in fastlane-plugin-[plugin_name].gemspec file

Open terminal again, go to your directory and into fastlane-plugin-[plugin_name] folder

bundle install
rake install
rake release

You will get an email from Ruby that your plugin is published to everyone :)

After you updated plugin_name.rb you need to go to your directory and into fastlane-plugin-[plugin_name] folder in terminal and you should update by using:

rake release