fix php 8.4 implicit nullable deprecation warnings #187

	---
	name: Run tests

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

	jobs:
	test:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	php: ['7.4', '8.0', '8.1']

	steps:
	- uses: actions/checkout@v2

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: "${{ matrix.php }}"

	# Cache Composer dependencies, based on the example at https://github.com/actions/cache/blob/main/examples.md#php---composer
	- name: Get Composer Cache Directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"

	- name: Cache Composer dependencies
	uses: actions/cache@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: php${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: \|
	php${{ matrix.php }}-composer-

	- name: Install dependencies using Composer
	run: composer install --prefer-source --no-interaction

	- name: Run tests
	run: make test

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