runc: support multi-container delete and update runtime-spec

[yzewei]

Summary

This PR updates the delete operation in the runtime-spec to support deleting multiple containers at once.

Changes

• Lifecycle section updated to reference one or more container IDs for delete
• Delete operation signature updated to delete <container-id> [<container-id> ...]
• Errors must be reported per container; one failing container does not block others

Motivation

Maintainers requested an update to the specification to clarify multi-container delete semantics before implementing multi-delete support in runtimes.

[cyphar]

NACK.

These runtime operations are meant to be as minimal as possible, and may not even describe a CLI interface. In other words, not every runc feature needs to also become part of the runtime-spec.

[AkihiroSuda]

runtime-spec/runtime.md

Line 95 in 5610abd

Note: these operations are not specifying any command-line APIs, and the parameters are inputs for general operations.

I agree with @cyphar

This seems to be the scope of the runc's implementation details.