chore: add pull request permissions to commitlint #750

Job	Run time
check-flavor	7s
validate (upgrade, registry1) / run	13m 16s
validate (install, registry1) / run	12m 45s
validate (install, upstream) / run	12m 59s
validate (install, unicorn) / run	14m 50s
validate (upgrade, upstream) / run	16m 3s
validate (upgrade, unicorn) / run	15m 17s
	1h 25m 17s

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