ZIm/crates/eval/examples/standardized_docker_dependency_checks/prompt.md

I need to improve how our codebase handles Docker dependency checks and error reporting. Right now, the logic for verifying Docker and buildx installations is scattered across different classes, and the error messages aren't consistent. I'd like a more unified approach where we centralize these checks in a single place, making it easier to maintain and reuse. Additionally, we should introduce a dedicated error type for dependency-related failures instead of repurposing existing errors like BuildError. The changes should ensure that any command requiring Docker (like builds or registry logins) properly validates dependencies first, with clear error messages if something is missing. The solution should be clean, follow existing patterns in the codebase, and include any necessary test updates to reflect the new behavior.