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Implement native OIDC-based authentication for Chainguard's container registry, following the same pattern as the existing AWS ECR integration. When registry is set to cgr.dev, the action automatically exchanges a GitHub Actions OIDC token with Chainguard's STS endpoint for a short-lived registry credential, removing the need for chainctl or long-lived pull tokens. New inputs: chainguard (auto/true/false), chainguard-identity. Signed-off-by: Augustus Nguyen <theflash28012002@gmail.com>