The docker-labeled runner's image is node:20-bookworm, needed for the
checkout/cache actions (both Node-based). Overriding it with
container: rust:1-bookworm dropped Node from the image entirely, so
checkout failed with "node: executable file not found in $PATH". The
rust-ci label (see sporah's workflow) points at a custom image with
both Rust and Node preinstalled, avoiding the conflict.
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