Add reusable phplinter-workflow #84

Job	Run time
Quality control	28s
Security checks	24s
Linter	1m 20s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Unit tests, PHP ${{ matrix.php-versions }}, ${{ matrix.operating-system }}	0s
Code coverage	0s
Cleanup artifacts	0s
	2m 12s

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