Add schedule for code quality workflow #100

Job	Run time
code-quality / Lint Gherkin Feature files	15s
code-quality / Spell check	8s
code-quality / PHPCS	5m 8s
code-quality / Lint GitHub Actions workflows	5s
code-quality / PHPStan	4m 28s
code-quality / Lint PHP files	4m 25s
	14m 29s

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