Adds two methods to ContainerRuntime so the upcoming ProdContainerOrchestrator
can inspect local image storage and build images from BuildConfig:
- image_exists(image_ref) -> Result<bool>: local-storage check only, does
not consult registries. Distinguishes exit 0 (present) from exit 1
(absent) from other failures (environment error).
- build_image(&BuildConfig) -> Result<()>: shells out to podman/docker
build with -t, -f, deterministically-sorted --build-arg pairs, and the
context path last.
Implemented on all three runtimes:
- PodmanRuntime: new podman_cli helper shells out alongside the existing
HTTP API calls (build and image inspect are awkward over the HTTP API)
- DockerRuntime: native docker CLI, same exit-code semantics
- AutoRuntime: delegates to the selected inner runtime
Argv construction extracted into pure build_args_for_podman helper so it
can be unit-tested without a real podman. 4 new tests cover minimal args,
custom Dockerfile path, deterministic build-arg sorting (guards against
HashMap iteration non-determinism), and context-is-last (positional arg
placement is load-bearing for podman build).
Step 2 of docs/rust-orchestrator-migration.md. 25/25 tests pass.
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