add new method of determining free port #204

	name: Ruby Unit Tests

	on:
	push:
	pull_request:

	jobs:
	test:
	strategy:
	fail-fast: false
	matrix:
	backend: ['ncbo_cron', 'ncbo_cron-agraph'] # ruby runs tests with 4store backend and ruby-agraph runs with AllegroGraph backend
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: copy config.rb file from template
	run: cp config/config.test.rb config/config.rb
	- name: Build docker compose
	run: docker compose build
	- name: Run unit tests
	run: \|
	ci_env=`bash <(curl -s https://codecov.io/env)`
	docker compose run $ci_env -e CI --rm ${{ matrix.backend }} bundle exec rake test TESTOPTS='-v'
	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@v4
	with:
	token: ${{ secrets.CODECOV_TOKEN }}
	flags: unittests
	verbose: true
	fail_ci_if_error: false # optional (default = false)

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