Test: build toolchain container image - #2
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Add a Podman-based build toolchain image (build.Containerfile) with pinned Rust compiler, rustfmt, clippy, and just. The base image is pinned by digest for reproducibility. The justfile gains two new recipes: - build-image: builds the toolchain image, skipping if unchanged - in-container: runs any just recipe inside the toolchain image The image is tagged with a content hash of the Containerfile so build-image can detect staleness without rebuilding. Named volumes cache the cargo registry and git checkouts across runs.
Run `just ci` on pushes to main and pull requests. The justfile's ci recipe delegates to `in-container "checks"`, keeping the workflow minimal and the justfile as the single source of truth for what CI does. The build toolchain image is cached as a tar archive via actions/cache, keyed on the Containerfile content hash. On cache hit, podman load restores the image and build-image skips the rebuild.
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Cache the target/ directory via actions/cache, keyed on the toolchain (Containerfile hash) and dependency lockfile. Project crate artifacts are pruned after each run so only compiled dependencies are stored. A restore-keys prefix allows partial cache hits when dependencies change.
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Test run of the build toolchain container and CI workflow.