Add the remaining content from the old Jenkins release job #64

	name: Rubocop

	on: [push, pull_request]

	permissions:
	contents: read

	jobs:
	rubocop:
	runs-on: ubuntu-latest
	env:
	BUNDLE_ONLY: rubocop

	steps:
	- uses: actions/checkout@v3

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	bundler-cache: true

	- name: Run Rubocop
	run: bundle exec rubocop --parallel --format simple

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