Execute agent with phpt tests delivered with PHP source code #446

Job	Run time
build / setup-build-matrix / setup-build-matrix	1s
build / build-agent-library (linux-x86-64)	5m 34s
build / build-agent-library (linuxmusl-x86-64)	5m 0s
run-phpt-tests (7.2)	21m 1s
run-phpt-tests (7.3)	20m 17s
run-phpt-tests (7.4)	15m 41s
run-phpt-tests (8.0)	14m 38s
run-phpt-tests (8.1)	12m 14s
run-phpt-tests (8.2)	11m 51s
run-phpt-tests (8.3)	13s
	1h 46m 30s

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