POC: lightweight subprocess isolation via pcntl_fork() #981

Job	Run time
Coding Guidelines	46s
Dependency Validation	13s
Type Checker	25s
Unit Tests (ubuntu-latest, 8.2)	10s
Unit Tests (ubuntu-latest, 8.3)	10s
Unit Tests (ubuntu-latest, 8.4)	13s
Unit Tests (windows-latest, 8.2)	38s
Unit Tests (windows-latest, 8.3)	42s
Unit Tests (windows-latest, 8.4)	37s
End-to-End Tests (ubuntu-latest, 8.2)	38s
End-to-End Tests (ubuntu-latest, 8.3)	50s
End-to-End Tests (ubuntu-latest, 8.4)	41s
End-to-End Tests (windows-latest, 8.2)	1m 41s
End-to-End Tests (windows-latest, 8.3)	1m 49s
End-to-End Tests (windows-latest, 8.4)	1m 42s
Build PHAR	26s
Code Coverage	1m 27s
Test PHAR (8.2, pcov)	22s
Test PHAR (8.2, xdebug)	29s
Test PHAR (8.3, pcov)	16s
Test PHAR (8.3, xdebug)	29s
Test PHAR (8.4, pcov)	17s
Test PHAR (8.4, xdebug)	39s
	15m 40s

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