fix: change is_admin from array to function #354

Job	Run time
devcontainer / build	1m 49s
commit_lint / lint	16s
bundler_sqlx / prepare	1m 25s
bundler_test / test	1m 30s
policy_lint / lint	9s
docs_build / build	14s
helm_chart_lint / lint	11s
policy_test / test	7s
docs_lint / lint	8s
policy_container / build_publish	8s
helm_chart_publish / publish (bundler)	15s
helm_chart_publish / publish (opa)	18s
techdocs_publish / publish	4s
bundler_docs / build	1m 11s
bundler_lint / deny	22s
bundler_lint / lint	57s
bundler_container / build_publish	4m 34s
pages_build / combine	5s
pages_publish	0s
	13m 43s

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