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	On drivers that do not support multi-platform builds (the default `docker` driver), we do not support building attestations (unless using the containerd store). We need to check this feature before attempting to build using attestations. Also adds a test to ensure that attestations can be pushed to registries at all, and that it adequately fails on the docker driver. Signed-off-by: Justin Chadwell <me@jedevc.com>