ubuntu-rustup

A public Ubuntu 24.04 container image for ephemeral GitHub Actions Runner Controller (ARC) runners. It extends GitHub's official ARC runner image with:

• Rustup 1.29.0, installed without a default Rust toolchain so each repository's rust-toolchain.toml remains authoritative.
• build-essential and pkg-config for crates with native build dependencies.
• Docker CLI 29.7.2, Buildx 0.36.1, and Compose 5.5.0 for use with an external Docker daemon such as ARC's disposable Docker-in-Docker sidecar.

The image runs as the upstream runner user. Docker daemon binaries are not included; a Docker daemon must be supplied separately when workflows need one.

Pull

docker pull ghcr.io/docspec/ubuntu-rustup:24.04

Release tags are immutable. 24.04 and latest are moving aliases for the newest published Ubuntu 24.04 release. Deployments should pin the multi-platform digest of a release tag.

Platforms

• linux/amd64
• linux/arm64

Build locally

docker buildx build --load --tag ubuntu-rustup:local .

The build verifies checksums for downloaded Rustup and Compose binaries. Base images and GitHub Actions are pinned by digest or commit SHA and updated through reviewed dependency updates.