Build

use configurable keys for keeping static connections #161

Job	Run time
php-stan	26s
Test (7.4, --prefer-lowest, test_phpunit_legacy)	1m 26s
CS-Fixer	18s
Test (7.4, 5.4.*, test_phpunit_legacy)	1m 6s
Test (8, test_phpunit_legacy)	1m 31s
Test (8.1, test)	1m 2s
Test (8.2, 6.3.*, test)	1m 32s
Test (8.3, 6.4.*, test)	54s
Test (8.2, 7.0.*, test)	1m 2s
Test (8.3, dev, test)	1m 35s
Test (8.4, dev, test)	1m 34s
	12m 26s

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