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You'll want the Heroku CLI and rbenv installed.
$ brew install heroku rbenv ruby-build
You'll also need to be running redis locally so that Sidekiq can operate. You can run this easily within Docker.
$ docker run -it -p 6379:6379 redis
$ rbenv install
$ gem install bundler
$ bundle install
$ bundle exec rake db:migrate
$ heroku local
At this time the server will be available at http://localhost:5000.