Execute agent with phpt tests delivered with PHP source code #184

Job	Run time
build / build-agent-library (linux-x86-64)	4m 1s
build / build-agent-library (linuxmusl-x86-64)	3m 44s
run-phpt-tests (7.2)	22m 18s
run-phpt-tests (7.3)	20m 41s
run-phpt-tests (7.4)	16m 33s
run-phpt-tests (8.0)	11m 51s
run-phpt-tests (8.1)	11m 44s
run-phpt-tests (8.2)	12m 21s
run-phpt-tests (8.3)	16s
	1h 43m 29s

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