chore: fix test workflow permissions #742

Job	Run time
check-flavor	4s
validate (install, upstream) / run	14m 16s
validate (upgrade, registry1) / run	12m 44s
validate (install, unicorn) / run	14m 51s
validate (install, registry1) / run	14m 31s
validate (upgrade, unicorn) / run	13m 43s
validate (upgrade, upstream) / run	14m 11s
	1h 24m 20s

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