fix zip archive folder structure (contents have to be in subdirectory… #32

Job	Run time
test (8.1, MOODLE_404_STABLE, pgsql, false)	2m 33s
test (8.1, MOODLE_404_STABLE, mariadb, false)	2m 21s
test (8.1, MOODLE_405_STABLE, pgsql, false)	2m 38s
test (8.1, MOODLE_405_STABLE, mariadb, false)	2m 28s
test (8.2, MOODLE_404_STABLE, pgsql, false)	2m 26s
test (8.2, MOODLE_404_STABLE, mariadb, false)	2m 28s
test (8.2, MOODLE_405_STABLE, pgsql, false)	2m 44s
test (8.2, MOODLE_405_STABLE, mariadb, false)	2m 23s
test (8.3, MOODLE_404_STABLE, pgsql, false)	2m 25s
test (8.3, MOODLE_404_STABLE, mariadb, false)	2m 29s
test (8.3, MOODLE_405_STABLE, pgsql, false)	2m 23s
test (8.3, MOODLE_405_STABLE, mariadb, false)	2m 37s
test (8.3, main, mariadb, true)	2m 30s
	32m 25s

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