As a QE engineer, I want automated e2e tests for Advanced Container Storage Configuration, so that we can validate the feature works end-to-end across layer stores, image stores, and artifact stores.

Details

Create automated end-to-end tests for Advanced Container Storage Configuration covering all three storage types:

• Test additionalLayerStores configuration and lazy pulling behavior
• Test additionalImageStores configuration with pre-populated image caches
• Test additionalArtifactStores configuration with artifact resolution
• Validate ContainerRuntimeConfig API accepts configurations correctly
• Verify MCO generates correct storage.conf for all three storage types
• Confirm MachineConfig application and node reboot
• Test CRI-O resolves layers, images, and artifacts from additional stores in correct order
• Validate graceful fallback when additional stores are unavailable

Acceptance Criteria

• E2e test suite created covering all three storage configuration types
• Tests validate API → MCO → storage.conf → CRI-O flow
• Tests verify containers/pods can use additional storage locations
• Tests confirm no regressions for standard storage behavior
• Tests run successfully in CI
• Test documentation added
• PR merged with automated tests