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Accepted Answer
Depending on how you are using and starting Unicorn, the most straightforward way to do this would probably be to use a Procfile along with a tool like Foreman. This allows you to define separate tasks to start. E.g.:
web: unicorn -p $PORT -c ./config/unicorn.rb
worker: ./bin/delayed_job start
Then, running foreman start will launch both processes.
Foreman can also be used to generate a set of systemd units or Upstart confs based on the Procfile.