Add rustlang feature flag to wfe-yaml with support for all cargo and
rustup step types (15 total), including cargo-doc-mdx.
Schema additions: output_dir, package, features, all_features,
no_default_features, release, profile, toolchain, extra_args,
components, targets, default_toolchain fields on StepConfig.
Integration tests for compiling all step types from YAML, and
containerd-based end-to-end tests for running Rust toolchain
inside containers from bare Debian images.
YamlWorkflowFile supports both single (workflow:) and multi (workflows:)
formats. WorkflowSpec gains typed inputs/outputs declarations.
Type string parser for inline types ("string?", "list<number>", etc.).
load_workflow_from_str returns Vec<CompiledWorkflow>.
Backward-compatible load_single_workflow_from_str convenience function.
Standalone workspace crates for BuildKit image building and containerd
container execution. Config types, YAML schema integration, compiler
dispatch, validation rules, and mock-based unit tests.
Current implementation shells out to buildctl/nerdctl — will be
replaced with proper gRPC clients (buildkit-client, containerd protos)
in a follow-up. Config types, YAML integration, and test infrastructure
are stable and reusable.
wfe-buildkit: 60 tests, 97.9% library coverage
wfe-containerd: 61 tests, 97.8% library coverage
447 total workspace tests.
