Add ability to configure private container registry credentials in spec.yml
for deployments using images from registries like GHCR.
- Add get_image_registry_config() to spec.py for parsing image-registry config
- Add create_registry_secret() to create K8s docker-registry secrets
- Update cluster_info.py to use dynamic {deployment}-registry secret names
- Update deploy_k8s.py to create registry secret before deployment
- Document feature in deployment_patterns.md
The token-env pattern keeps credentials out of git - the spec references an
environment variable name, and the actual token is passed at runtime.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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