feat: Add payload checking #3

	# SPDX-FileCopyrightText: Copyright 2021 M2mobi B.V., Amsterdam, The Netherlands
	# SPDX-FileCopyrightText: Copyright 2022 Move Agency Group B.V., Zwolle, The Netherlands
	# SPDX-License-Identifier: CC0-1.0

	name: Integration Tests
	on: [push, pull_request]

	jobs:
	phpunit:
	runs-on: ubuntu-latest
	continue-on-error: ${{ matrix.experimental }}
	name: "PHP-${{ matrix.php-versions }}: Integration"
	strategy:
	matrix:
	php-versions: ['8.3']
	experimental: [false]
	include:
	- php-versions: 8.4
	experimental: true
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php-versions }}
	extensions: uopz
	tools: phpunit:9.5.x

	- name: Setup problem matchers for PHP
	run: echo "::add-matcher::${{ runner.tool_cache }}/php.json"

	- name: Setup problem matchers for PHPUnit
	run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"

	- name: Install dependencies
	run: composer update

	- name: Setup payload dumper
	run: \|
	echo << EOF >> get_payload.php
	<?php
	include_once "./vendor/autoload.php";
	$message = new \ApnsPHP\Message();
	echo $message->getPayload();
	?>
	EOF

	- name: Run Payload dumper
	run: php ./get_payload.php > payload.json

	- name: Install JSONSchema
	run: pipx install check-jsonschema

	- name: Check payload
	run: check-jsonschema --schemafile doc/schemas/message.schema.json payload.json

Provide feedback