Test

Config: add tests for setting `--extensions` #2591

Job	Run time
Coverage: 5.5 (Win)	2m 16s
Coverage: 8.4 (Win)	1m 33s
Coverage: 8.4 (Linux)	4m 31s
Coverage: 5.4 (Linux)	26m 27s
Coverage: 7.2 with custom ini settings (Linux)	6m 11s
Build Phar on PHP: 8.0 / Build Phar on PHP: 8.0	24s
PHP: 8.0 with libxml 2.11 (Linux)	59s
PHP: 8.3 with libxml 2.13 (Linux)	55s
PHP: 5.5 (Linux)	8m 10s
PHP: 7.2 (Linux)	1m 32s
PHP: 8.3 (Win)	52s
PHP: 5.4 (Linux)	1m 38s
PHP: 7.0 (Win)	1m 59s
PHP: 7.4 (Linux)	1m 0s
PHP: 7.4 (Win)	1m 8s
PHP: 8.5 (Linux)	1m 0s
PHP: 8.1 (Win)	55s
PHP: 8.5 (Win)	50s
PHP: 5.5 (Win)	1m 46s
PHP: 8.2 (Win)	1m 1s
PHP: 7.2 (Win)	1m 34s
PHP: 8.1 (Linux)	51s
PHP: 8.4 (Linux)	37s
PHP: 5.6 (Win)	6m 50s
PHP: 7.0 (Linux)	2m 5s
PHP: 7.0 with custom ini settings (Linux)	2m 3s
PHP: 8.0 (Win)	55s
PHP: 8.4 (Win)	32s
PHP: 5.5 with custom ini settings (Linux)	7m 57s
PHP: 8.2 (Linux)	58s
PHP: 7.1 (Win)	1m 32s
PHP: 7.3 (Win)	59s
PHP: 7.1 (Linux)	1m 29s
PHP: 5.6 (Linux)	6m 48s
PHP: 7.3 (Linux)	1m 0s
coveralls-finish	6s
	1h 41m 23s

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