Rewrite Dockerfile to share layers with analyzer#195
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The main goal of this is to bring the Dockerfiles of the test-runner and analyzer in sync, so they can share the big layers containing the Rust toolchain and local cargo registry. Some incidental changes / improvements that were made: * Use an official base image with a nightly Rust toolchain, but pinned to a specific hash. This avoids our cache being invalidated every day, without us needing to copy-paste the upstream build script. * Make local-registry/Cargo.toml more readable for users by moving irrelevant stuff to the bottom. Exercises contain a link to this file, so that students can check themselves which crates are available. * Use heredoc in the Dockerfile for better readability and to reduce the number of intermediate layers generated during a build.
IsaacG
approved these changes
May 5, 2026
Co-authored-by: Isaac Good <IsaacG@users.noreply.github.com>
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The main goal of this is to bring the Dockerfiles of the test-runner and analyzer in sync, so they can share the big layers containing the Rust toolchain and local cargo registry.
Some incidental changes / improvements that were made:
Use an official base image with a nightly Rust toolchain, but pinned to a specific hash. This avoids our cache being invalidated every day, without us needing to copy-paste the upstream build script.
Make local-registry/Cargo.toml more readable for users by moving irrelevant stuff to the bottom. Exercises contain a link to this file, so that students can check themselves which crates are available.
Use heredoc in the Dockerfile for better readability and to reduce the number of intermediate layers generated during a build.
The forum post discussing this:
https://forum.exercism.org/t/requesting-rust-docker-base-repository/48577