Execute agent with phpt tests delivered with PHP source code #444

Job	Run time
build / setup-build-matrix / setup-build-matrix	1s
build / build-agent-library (linux-x86-64)	5m 26s
build / build-agent-library (linuxmusl-x86-64)	4m 58s
run-phpt-tests (7.2)	22m 5s
run-phpt-tests (7.3)	20m 39s
run-phpt-tests (7.4)	16m 29s
run-phpt-tests (8.0)	14m 59s
run-phpt-tests (8.1)	11m 53s
run-phpt-tests (8.2)	11m 18s
run-phpt-tests (8.3)	10s
	1h 47m 58s

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