ci: add commitlint to enforce conventional commits #85

Job	Run time
commit_lint / lint	10s
devcontainer / build	1m 38s
bundler_test / test	1m 21s
bundler_sqlx / prepare	1m 20s
docs_lint / lint	14s
docs_build / build	13s
helm_chart_lint / lint	15s
policy_lint / lint	5s
policy_test / test	4s
policy_container / build_publish	5s
helm_chart_publish / publish (opa)	15s
helm_chart_publish / publish (bundler)	14s
techdocs_publish / publish	4s
bundler_docs / build	1m 0s
bundler_lint / lint	54s
bundler_container / build_publish	17s
pages_build / combine	3s
pages_publish	0s
	8m 12s

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