Execute agent with phpt tests delivered with PHP source code #443

Job	Run time
build / setup-build-matrix / setup-build-matrix	1s
build / build-agent-library (linux-x86-64)	5m 19s
build / build-agent-library (linuxmusl-x86-64)	5m 0s
run-phpt-tests (7.2)	21m 55s
run-phpt-tests (7.3)	20m 35s
run-phpt-tests (7.4)	15m 40s
run-phpt-tests (8.0)	15m 27s
run-phpt-tests (8.1)	11m 51s
run-phpt-tests (8.2)	12m 14s
run-phpt-tests (8.3)	11s
	1h 48m 13s

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