ci: publish OCI artifacts

[damacus]

Summary

Publish this cookbook's release artefacts as OCI images through the shared Sous Chefs release workflow.

• Update Sous Chefs shared workflow and action references to @main.
• Enable publish_oci: true.
• Grant the release workflow the required package and attestation permissions while preserving the existing release secrets.

Verification

• /opt/homebrew/bin/actionlint
• git diff --check

Risks / follow-ups

OCI publication runs only when the release workflow is triggered on main.

[github-actions]

Slowest examples

Top 0 slowest examples (0 seconds, NaN% of total time)

Example	Description	Time in seconds