rspec on several ruby versions and also macos #21

	name: rspecs

	on:
	workflow_dispatch: {}
	push:
	branches: [test-workflow]
	tags: v*

	jobs:
	rspec:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	# note 20-Jul-2023 2.7.8 is EOL
	ruby_version: ['2.7.8', '3.0.6', '3.1.4', '3.2.2']

	steps:
	- uses: actions/checkout@v3

	- uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby_version }}

	- run: bundle install

	# install from ppa for up-to-date version
	- name: update ubuntu packages
	run: \|
	sudo apt-get update

	# otherwise it prompts for timezone
	sudo apt-get install -y tzdata
	sudo apt-get install -y software-properties-common

	- name: install swi-prolog from ppa
	run: \|
	# Stable versions
	sudo apt-add-repository -y ppa:swi-prolog/stable
	sudo apt-get update
	sudo apt-get install -y swi-prolog-nox

	# Development versions
	# sudo apt-add-repository ppa:swi-prolog/devel
	# sudo apt-get update
	# sudo apt-get install -y swi-prolog-nox

	- run: rspec

	rspec-macos:
	runs-on: macos-latest
	strategy:
	matrix:
	# note 20-Jul-2023 2.7.8 is EOL
	ruby_version: ['2.7.8', '3.0.6', '3.1.4', '3.2.2']

	steps:
	- name: install swi-prolog
	run: \|
	/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
	brew install swi-prolog

	# for possible future debugging
	# otool -L $(which swipl)
	# swipl --dump-runtime-variables=sh
	# env
	# find /usr/local/Cellar/swi-prolog/9.0.4 -ls
	# false

	- uses: actions/checkout@v3

	- uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby_version }}

	- run: bundle install

	- run: rspec

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