Merge pull request #180 from mtelvers/overlayfs #660

Job	Run time
docker (ubuntu-latest, 4.14.x)	14m 48s
build_rsync (ubuntu-latest, 4.14.x, rsync_hardlink)	25m 14s
docker (ubuntu-latest, 5.2.x)	12m 28s
build (ubuntu-latest, 4.14.x)	26m 55s
build_rsync (ubuntu-latest, 4.14.x, rsync_copy)	14m 36s
build (ubuntu-latest, 5.2.x)	26m 20s
build_rsync (ubuntu-latest, 5.2.x, rsync_hardlink)	22m 16s
build_rsync (ubuntu-latest, 5.2.x, rsync_copy)	13m 40s
	2h 36m 17s

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