ci: add commitlint to enforce conventional commits #76

Job	Run time
devcontainer / build	1m 40s
commit_lint / lint	9s
bundler_test / test	1m 25s
bundler_sqlx / prepare	2m 57s
docs_build / build	14s
docs_lint / lint	5s
helm_chart_lint / lint	20s
policy_lint / lint	4s
policy_test / test	4s
policy_container / build_publish	5s
techdocs_publish / publish	2s
helm_chart_publish / publish (opa)	9s
helm_chart_publish / publish (bundler)	13s
bundler_docs / build	1m 3s
bundler_lint / lint	55s
bundler_container / build_publish	3m 3s
pages_build / combine	9s
pages_publish	0s
	12m 37s

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