EPIC Goal

Update the RHDH init container, Helm chart, and Operator to support configuring and extracting multiple plugin catalog OCI images to separate subdirectories under /extensions.

Background/Feature Origin

Single plugin catalog support via CATALOG_INDEX_IMAGE is already implemented. The init container extracts the contents of the plugin catalog OCI image to /extensions, and the catalog backend module recursively scans that directory for Plugin/Package catalog entity YAML files.

This epic extends that capability to support multiple catalog sources. The backend already supports multiple sources implicitly (recursive glob of /extensions/{}/{*}.yaml), so only the init container and deployment configs need changes.

Why is this important?

• Flexibility: Organizations can combine official RHDH plugins with community and internal plugins
• Separation of concerns: Allows community plugins to be distributed via separate catalog without modifying RHDH core
• Enterprise customization: Customers can add proprietary/internal plugin catalogs alongside supported plugins

Out of Scope

Merging dynamic-plugins.default.yaml from multiple sources is out of scope for this epic, only the primary/first catalog source provides dynamic-plugins.default.yaml (plugin installation configurations). Additional sources contribute only catalog metadata (Plugin/Package YAMLs for the Extensions UI). Merging default configs from multiple sources may be considered in a future enhancement.

User Scenarios

Dependencies (internal and external)

Acceptance Criteria

Release Enablement/Demo - Provide necessary release enablement details
and documents

DEV - Upstream code and tests merged: <link to meaningful PR or GitHub
Issue>

DEV - Upstream documentation merged: <link to meaningful PR or GitHub
Issue>

DEV - Downstream build attached to advisory: <link to errata>

QE - Test plans in Playwright: <link or reference to playwright>

QE - Automated tests merged: <link or reference to automated tests>

DOC - Downstream documentation merged: <link to meaningful PR>