exporter: default attestations to OCI artifacts - #6914
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Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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fixes #6171
This changes attestation manifests to use the OCI artifact form by default when OCI media types are enabled in the current compatibility version.
The exporter now tracks whether
oci-artifactwas omitted or explicitly set, which preservesoci-artifact=falseas the opt-out path and keeps explicitoci-artifact=truebehavior intact.OCI artifact storage is now supported across the targeted registries, so the previous opt-in default is no longer buying much except old behavior.