osbuild-mpp supports yaml files. The advantage of yaml is that it's less
verbose and allows comments. This way, we can start documenting all the
test manifests in this repository.
This is the first step: This commit just renames the files, so we keep the
history intact. Remember: YAML is a super-set(*) of JSON, so this is fine.
There is no functional change in this commit.
(*) There are some caveats, but we don't need to care in this case.
Create a squashfs image from the root file system and append it
to the existing initram fs. Passing `root=live:/rootfs.img`
is enough to use the existing dmsquash machiner in dracut.
