chore: add pull request permissions to commitlint #749

Job	Run time
check-flavor	7s
validate (upgrade, registry1) / run	1m 59s
validate (install, unicorn) / run	2m 1s
validate (install, registry1) / run	2m 1s
validate (install, upstream) / run	2m 1s
validate (upgrade, unicorn) / run	2m 2s
validate (upgrade, upstream) / run	2m 1s
	12m 12s

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