Features:

• Added a /preload/tags/{tag} endpoint on kraken-agent to trigger docker pull on docker daemon.
• Added support for self-hosted S3/minio.

Improvements:

• Refactored interfaces to allow kraken components to be used as libraries.
• Switched from glide to go mod for dependency management.
• Made Helm chart more portable
• Migrated from debian:9 to debian:10 for testing.
• Migrated from Go 1.11 to Go 1.14.
• Refactored authentication logic so auth tokens can be cached.
• Added timeout and disabled HTTP fallback for registry backend.

Next release: Focus on improving push performance and disk space management.