Execute agent with phpt tests delivered with PHP source code #237

Job	Run time
build / build-agent-library (linux-x86-64)	3m 45s
build / build-agent-library (linuxmusl-x86-64)	3m 38s
run-phpt-tests (7.2)	22m 0s
run-phpt-tests (7.3)	21m 4s
run-phpt-tests (7.4)	15m 12s
run-phpt-tests (8.0)	11m 28s
run-phpt-tests (8.1)	11m 45s
run-phpt-tests (8.2)	11m 41s
run-phpt-tests (8.3)	12s
	1h 40m 45s

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