Sync. workflow across skopeo, buildah, and podman
Sync. workflow across skopeo, buildah, and podman

Besides adding ***BIG FAT WARNING*** this commit updates the
containers-repo. logic to only (and properly) handle the `stable` image
(both version and `latest` tags).  This change was already discussed at
length with @TomSweeneyRedHat.

Signed-off-by: Chris Evich <352d8596d782a469eafa66a46434e15a449859ce@redhat.com>

rhatdan/buildah,nalind/buildah-1,nalind/buildah-1,projectatomic/buildah,TomSweeneyRedHat/buildah,projectatomic/buildah,projectatomic/buildah,nalind/buildah,rhatdan/buildah,rhatdan/buildah,nalind/buildah,nalind/buildah-1,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah