Use `jruby` instead of `circleci/jruby` images #1

	name: CI

	on:
	push:
	branches:
	- master
	pull_request:
	workflow_dispatch:

	permissions: # added using https://github.com/step-security/secure-workflows
	contents: read

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	main:
	name: ${{ matrix.os }} ${{ matrix.ruby }}
	runs-on: ubuntu-latest
	env:
	# See https://github.com/tmm1/test-queue#environment-variables
	TEST_QUEUE_WORKERS: 2
	strategy:
	fail-fast: false
	matrix:
	ruby: ['2.6', '2.7', '3.0', '3.1', '3.2', 'head', 'jruby-9.4']
	steps:
	- name: checkout
	uses: actions/checkout@v3
	- name: set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	- name: spec
	run: bundle exec rake spec
	- name: ascii_spec
	run: bundle exec rake ascii_spec
	- name: internal_investigation
	run: bundle exec rake internal_investigation

Provide feedback