It is an example app and a basic template for devise auth in rails 6 with omni github auth.
git clone https://github.com/imhta/rails_6_devise_example.git
cd rails_6_devise_example
bundle install
yarn install --check-files
rails db:migrate
To start rails server
rails server
To start webpack server (rails 6 default is to use webpack)
gem install foreman
foreman start -f Procfile.dev