Show command help for missing argument and required option #241

	name: Coding standards
	on: [pull_request]
	jobs:
	phpcs:
	name: phpcs
	runs-on: ubuntu-20.04
	timeout-minutes: 15
	steps:
	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: 8.1
	# No composer, but we need our commandline tool.
	tools: none, phpcs

	# The checkout action refuses to put it outside, so we have to do it in
	# two steps.
	- name: Get Backdrop coding standard
	uses: actions/checkout@v3
	with:
	repository: backdrop-ops/phpcs
	ref: 1.0.0
	path: phpcs
	- name: Move standard outside current dir
	run: mv phpcs ..

	- name: Checkout code
	uses: actions/checkout@v3

	- name: Run CodeSniffer
	run: phpcs --standard=../phpcs/Backdrop --report=.github/misc/Github.php --basepath=. *

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