We shipped some performance improvements and bug fixes to our depot CLI.

• Improved error reporting when a COPY statement tries to copy a file that can't be found
• Introduce a depot push command to push images out of ephemeral registries to destination registries
• Added the ability to disable OpenTelemetry in BuildKit
• Clarification of --token parameter in various commands
• Default to CSV output if the environment doesn't have tty
• Improve build context transfer performance via gzip compression (experimental)