Add missing permissions to build_charms_with_cache.yaml workflow #492

Job	Run time
Lint	15s
Build charms / Get workflow version / Get workflow version	4s
Build charms / Collect charms	5s
Build charms / Build mysql-router-k8s charm \| 22.04	2m 22s
integration-database	19m 57s
	22m 43s

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