Add some minimal checks to the CI workflow #8

	name: Contibutions CI
	on:
	push:
	branches: [ main ]
	pull_request:
	jobs:
	validation:
	runs-on: ubuntu-latest
	steps:
	-
	uses: actions/checkout@v3
	-
	name: Validate composer configuration
	run: composer validate --strict
	-
	name: Cache Composer packages
	id: composer-cache
	uses: actions/cache@v3
	with:
	path: vendor
	key: ${{ runner.os }}-php-${{ hashFiles('**/composer.json') }}
	restore-keys: \|
	${{ runner.os }}-php-
	-
	name: Install dependencies
	if: steps.composer-cache.outputs.cache-hit != 'true'
	run: composer install --prefer-dist --no-progress
	-
	name: Main script does not fail to start
	run: ./contriblog --help
	-
	name: Lint runs an example passes linting
	run: ./contriblog lint examples/contributions.yml
	-
	name: Can format and it is a no operation for the example
	run: \|
	./contriblog format examples/contributions.yml
	git diff --exit-code
	-
	name: HTML generation runs
	run: ./contriblog html examples/contributions.yml

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