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Add functions to detect and handle multi-architecture OCI Image Index
format with automatic platform selection during import. Also add
oci-multiarch.bbclass for build-time multi-arch OCI creation.
Runtime support (vcontainer-common.sh):
- is_oci_image_index() - detect multi-arch OCI images
- get_oci_platforms() - list available platforms
- select_platform_manifest() - select manifest for target architecture
- extract_platform_oci() - extract single platform to new OCI dir
- normalize_arch_to_oci/from_oci() - architecture name mapping
- Update vimport to auto-select platform from multi-arch images
Build-time support (oci-multiarch.bbclass):
- Create OCI Image Index from multiconfig builds
- Collect images from vruntime-aarch64, vruntime-x86-64
- Combine blobs and create unified manifest list
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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