Add CDK app for apiref.phpstan.org infrastructure #28599

Job	Run time
Compiler Tests	2m 21s
extension-tests / Check PHAR checksum	12s
integration-tests / Check PHAR checksum	13s
other-tests / Check PHAR checksum	15s
Download base SHA PHAR	0s
Commit PHAR	0s
Checksum PHAR	0s
PHAR Prefix Diff	0s
extension-tests / ${{ matrix.extension-name }} (${{ matrix.php-version }}) ${{ matrix.script }}	0s
integration-tests / PMMP Tests	-1s
integration-tests / Integration - ${{ matrix.name }}	-1s
integration-tests / Integration - ${{ matrix.repo }}	-1s
integration-tests / Integration - Update baselines	0s
other-tests / Other Tests	-1s
	2m 57s

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