comment on future macro possibilities #19

Job	Run time
build buildbox-amd64	1m 55s
build buildbox-arm64	1m 46s
define-matrix	4s
build testbox el8-arm64	3m 28s
build testbox el8-amd64	2m 58s
build testbox el10-arm64	40s
build testbox el9-arm64	2m 9s
build testbox el10-amd64	1m 41s
build testbox el9-amd64	1m 53s
merge-buildbox	13s
Merge ${{ matrix.distro }} Testbox images	-1s
	16m 46s

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