ci: use reusable workflows #111

Job	Run time
lint	28s
test (debian, latest)	2m 59s
test (debian, bullseye)	2m 42s
test (debian, buster)	2m 0s
test (enterpriselinux, 8)	1m 18s
test (enterpriselinux, latest)	2m 17s
test (fedora, 38)	2m 52s
test (fedora, 39)	3m 34s
test (fedora, latest)	2m 44s
test (opensuse, latest)	1m 49s
test (ubuntu, latest)	2m 57s
test (ubuntu, focal)	3m 17s
	28m 57s

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