As described inline, we need to ensure the underlying directories in
the image are correctly labeled, or we get all manner of services
failing during boot with selinux in enforcing mode. Although the
problem is generic, this first shows up in Fedora 30 as systemd has
become more strict about namespace failures (I think) [1].
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1663040#c22
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