Container registry security image management

Implement secure container image management with vulnerability scanning, signing, and policy enforcement. Registry security: 1. Private registries: Harbor, AWS ECR, Google Container Registry with RBAC access control. 2. Image signing: Docker Content Trust, Notary for image authenticity verification. 3. Vulnerability scanning: Trivy, Clair, Twistlock integrated into push/pull workflows. 4. Access control: IAM integration, token-based authentication, service account permissions. Image lifecycle management: 1. Tagging strategy: semantic versioning, immutable tags, environment-specific tags. 2. Retention policies: automatic cleanup of old images, keep last 10 versions per branch. 3. Multi-architecture support: AMD64, ARM64 builds, manifest lists for platform-specific pulls. Security policies: 1. Base image governance: approved base images only, regular security updates, minimal surface area. 2. Scanning thresholds: block deployment for critical vulnerabilities, allow with medium/low. 3. Runtime policies: admission controllers preventing non-compliant containers. Image optimization: 1. Layer caching: optimize Dockerfile instruction order, shared base layers. 2. Size reduction: multi-stage builds, distroless images, unnecessary package removal. 3. Build automation: automated security patching, dependency updates, scheduled rebuilds. Registry operations: 1. High availability: multi-region replication, load balancing, disaster recovery. 2. Performance: CDN integration, regional caching, bandwidth optimization. Compliance: audit logs for image access, retention policies for regulatory requirements, SBOM (Software Bill of Materials) generation.