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docs: document multi-platform limitation for share-image-jobs approach #25306

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8 changes: 8 additions & 0 deletions content/manuals/build/ci/github-actions/share-image-jobs.md
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Expand Up @@ -13,6 +13,14 @@ in a workflow using the [actions/upload-artifact](https://github.com/actions/upl
and [actions/download-artifact](https://github.com/actions/download-artifact)
actions:

> [!NOTE]
>
> This approach only works for single-platform images. The `type=docker` exporter
> produces a tar archive that `docker load` can import, but multi-platform image
> indexes cannot be exported or loaded this way. For multi-platform builds, use a
> registry to push and pull the image between jobs, or share build cache using the
> [GitHub Actions cache or registry cache exporters](cache.md).

```yaml
name: ci

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