given that we are moving to building our own machine images, we have
decided to use zstd compression as it is superior in speed to the
alternatives. as such, this pr adds zstd to our machine code; and also
has to account for dealing with sparseness on darwin; which the default
zstd golang library does not.
[NO NEW TESTS NEEDED]
Signed-off-by: Brent Baude <bbaude@redhat.com>
In #20538, I was asked to consider refactoring the new OCI pull code
from within the generic machine directory. This is something I had
tried when originally coding it but it became apparent that a much
larger refactor to prevent circular deps was needed. Because I did not
want to pollute the initial PR with that refactor, I asked for the PR to
merge first. This is the refactor that needed to be done.
Signed-off-by: Brent Baude <bbaude@redhat.com>
Brent Baude