Fix nvm loading issue. #693

Job	Run time
CI test (make validate)	1m 0s
Code coverage (codecov)	58s
Build moodle-plugin-ci.phar	34s
Integration tests (8.3, main, true)	6m 21s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 13s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 7s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 23s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 42s
Integration tests (8.0, MOODLE_400_STABLE)	5m 47s
Integration tests (8.0, MOODLE_311_STABLE)	4m 49s
Integration tests (7.4, MOODLE_39_STABLE)	5m 3s
SelfUpdate tests (PHAR) (8.3)	36s
Integration tests (PHAR) (8.3, main, true)	5m 55s
SelfUpdate tests (PHAR) (8.2)	32s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	5m 57s
SelfUpdate tests (PHAR) (8.1)	26s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 40s
SelfUpdate tests (PHAR) (8.0)	29s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 46s
SelfUpdate tests (PHAR) (7.4)	18s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 46s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 22s
	1h 27m 44s

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