fn adjust_etc_containers(tempdir: &Dir) -> Result<()>Expand description
Handle /etc/containers readonly mount.
Ufortunately today podman requires that /etc be writable for
/etc/containers/networks. bib today creates this as a readonly mount:
https://github.com/osbuild/osbuild/blob/4edbe227d41c767441b9bf4390398afc6dc8f901/osbuild/buildroot.py#L243
Work around that by adding a transient, writable overlayfs.