exporter: force enabling inline attestations for image export #3466
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As discussed with @tonistiigi, we don't need the complexity of #3403, we just need to rework the behavior of inline attestations slightly.
local
andtar
exporters, never export inline attestationsoci
anddocker
exporters, only export inline attestations if we are already exporting an image index (e.g. in the case of a multi-platform image, or if we have other attestations to export as well)image
exporter, always export inline attestations, forcing generation of an index even if we otherwise wouldn't.No corresponding buildx changes are necessary.