Add separate rule for nullable_type_declaration #32

	name: Lint flex files

	on: [push, pull_request]
	jobs:
	run:
	runs-on: ${{ matrix.operating-system }}
	strategy:
	matrix:
	operating-system: [ubuntu-latest]
	php-versions: ['8.1', '8.2', '8.3']
	composer-options: ['']
	composer-versions: ['composer:v2']
	fail-fast: false
	name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }} with ${{ matrix.composer-versions }} ${{ matrix.composer-options }}
	steps:
	- name: Checkout
	uses: actions/checkout@master
	- name: Install PHP
	uses: shivammathur/setup-php@master
	with:
	php-version: ${{ matrix.php-versions }}
	tools: ${{ matrix.composer-versions }}
	extensions: mbstring
	- name: Get composer cache directory
	id: composercache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"
	- name: Cache dependencies
	uses: actions/cache@v2
	with:
	path: ${{ steps.composercache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
	restore-keys: ${{ runner.os }}-composer-
	- name: Install dependencies
	run: composer update --prefer-dist --no-progress --ignore-platform-req=php+ ${{ matrix.composer-options }}
	- name: Build flex files
	run: php scripts/build-flex.php
	- name: Check if flex files are up to date
	run: git diff --exit-code

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