update CI configuration and demo script to run the demo with Ruby 2.7.8 as a workaround for GitHub Action Ruby limitation. #125

	name: serpapi-ruby
	on:
	push:
	branches: [ master, dev ]
	pull_request:
	branches: [ master ]
	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	# test only recommend Ruby version (and stable version on the gitaction server)
	# GitHub action github.com/ruby/setup-ruby is pretty unstable with older Ruby version + dependencies
	# so, we only run a basic example with Ruby 2.7.8 after install the gem from the local build
	ruby-version: ['3.1.0','head']
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby ${{ matrix.ruby-version }}
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby-version }}
	- name: Install dependencies
	run: bundle install
	- name: lint
	run: bundle exec rake lint
	- name: tests
	env:
	SERPAPI_KEY: ${{ secrets.SERPAPI_KEY }}
	run: bundle exec rake test
	- name: oobt
	env:
	SERPAPI_KEY: ${{ secrets.SERPAPI_KEY }}
	run: bundle exec rake oobt
	- name: Run example with ruby 2.7.8
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: '2.7.8'
	- name: Install and run demo 2.7.8
	env:
	SERPAPI_KEY: ${{ secrets.SERPAPI_KEY }}
	run: rake install && ruby demo/demo.rb

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