feat(vmm): OCI registry image discovery and pull#589
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Add ability for VMM to discover available guest images from an OCI registry and pull them on-demand through the web UI. Images are pulled in the background with status tracked server-side, surviving page refreshes. The UI auto-refreshes every 3s while the registry panel is open. - New `image_registry` config field (e.g., "cr.kvin.wang/dstack/guest-image") - New RPC: ListRegistryImages, PullRegistryImage - Registry module: list tags via Docker Registry HTTP API v2, pull and extract via `docker export` - Background pull with pulling state in App memory - UI: Image Registry button + dialog with pull/status per tag
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Summary
image_registryconfig field to VMM for specifying an OCI registry (e.g.,cr.kvin.wang/dstack/guest-image)ListRegistryImages(lists tags with local/pulling status) andPullRegistryImage(background pull)docker pull+docker exportto extract flat image filestokio::spawntask; pulling state tracked server-side inApp.pulling_tags— survives page refreshTest plan
image_registryinvmm.toml, verifyListRegistryImagesreturns tagsimage_path