Fix Docker Registry Authentication and Multi-arch Image Annotations

[tekenstam]

What this PR does / why we need it

This PR addresses two issues with the container image workflow:

1. Registry Authentication: Fixes the image-push workflow that was failing with the error "No credentials found for registry keikoproj" by explicitly specifying the Docker registry.

2. Multi-arch Image Annotations: Adds proper annotations to multi-architecture container images using the correct annotation-index syntax, addressing the GitHub Packages warning about missing image description.

Changes made

• Added explicit docker.io/ prefix to all Docker image references
• Implemented the recommended annotation-index syntax for multi-arch manifests
• Added comprehensive OCI annotations (description, license, source, etc.)
• Disabled duplicate provenance to avoid conflicts with the dedicated attestation actions

How to verify it

• The image-push GitHub Action workflow should now successfully authenticate
• Multi-arch images should display proper metadata in GitHub Packages including description
• SLSA attestations should be correctly generated for both DockerHub and GitHub Container Registry