After changes to the inode size, the sysext installation runs out of
space because the installation happens on a mounted production image.
This is problematic because the /usr partition is only 1024MB in size
and gets full. Mount a temporary overlay so that we can use that for
installation, and discard it afterwards.
This also means we no longer need to disable verity and in fact could
live without copying the prod image. I won't make that change since
we're working on a new script to automate building of sysexts using the
overlay approach.
Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>
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