Execute agent with phpt tests delivered with PHP source code #148

Job	Run time
build / build-agent-library (linux-x86-64)	13m 55s
build / build-agent-library (linuxmusl-x86-64)	12m 20s
run-phpt-tests (7.2)	31m 48s
run-phpt-tests (7.3)	30m 17s
run-phpt-tests (7.4)	24m 7s
run-phpt-tests (8.0)	24m 1s
run-phpt-tests (8.1)	20m 41s
run-phpt-tests (8.2)	23m 32s
	3h 0m 41s

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