Make Moodle Install Clone step optional #673

Job	Run time
CI test (make validate)	56s
Code coverage (codecov)	58s
Build moodle-plugin-ci.phar	28s
Integration tests (8.3, main)	3m 52s
Integration tests (8.3, MOODLE_404_STABLE)	4m 26s
Integration tests (8.2, MOODLE_403_STABLE)	3m 45s
Integration tests (8.2, MOODLE_402_STABLE)	4m 9s
Integration tests (8.1, MOODLE_401_STABLE)	4m 36s
Integration tests (8.0, MOODLE_400_STABLE)	4m 18s
Integration tests (8.0, MOODLE_311_STABLE)	4m 10s
Integration tests (7.4, MOODLE_39_STABLE)	3m 36s
SelfUpdate tests (PHAR) (8.3)	53s
SelfUpdate tests (PHAR) (8.2)	28s
Integration tests (PHAR) (8.3, main)	6m 58s
SelfUpdate tests (PHAR) (8.1)	16s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE)	3m 47s
SelfUpdate tests (PHAR) (8.0)	26s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	3m 42s
SelfUpdate tests (PHAR) (7.4)	13s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	3m 6s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	4m 19s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	3m 42s
	1h 3m 4s

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