chore: fix test workflow permissions #741

Job	Run time
check-flavor	7s
validate (install, unicorn) / run	12m 55s
validate (install, upstream) / run	13m 7s
validate (upgrade, registry1) / run	12m 48s
validate (install, registry1) / run	13m 4s
validate (upgrade, unicorn) / run	13m 11s
validate (upgrade, upstream) / run	13m 15s
	1h 18m 27s

Provide feedback