Continuous Integration

Add notes about how to use mixins in libraries as I always forget #625

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Run time

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Job	Run time
shellcheck	4s
ruby (2.7)	55s
kitchen (centos-stream-9)	2m 21s
kitchen (ubuntu-2004)	2m 1s
ruby (3.1)	35s
kitchen (ubuntu-2204)	2m 12s
kitchen (ubuntu-2404)	1m 59s
	10m 7s