The Docker backend already supports user-configured volume mounts via
docker_volumes, but it was undocumented — missing from DEFAULT_CONFIG,
cli.py defaults, and configuration docs.
Changes:
- hermes_cli/config.py: Add docker_volumes to DEFAULT_CONFIG with
inline documentation and examples
- cli.py: Add docker_volumes to load_cli_config defaults
- configuration.md: Full Docker Volume Mounts section with YAML
examples, use cases (providing files, receiving outputs, shared
workspaces), and env var alternative
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