cachekit-io/runner

Custom GitHub Actions runner image for cachekit-io CI/CD.

Bakes in build tooling that doesn't change per-job, cutting minutes off every CI run.

What's baked in

Tool	Purpose
build-essential, pkg-config, libssl-dev	System build deps (C linker, OpenSSL headers)
uv	Python package manager (eliminates setup-uv action)
Rust stable + rustfmt, clippy	Rust toolchain (eliminates dtolnay/rust-toolchain)
Python 3.9–3.14	Pre-installed via uv (eliminates uv python install)

What stays in workflows

• uv sync — project-specific Python deps
• actions/cache — Rust target dir, Python venv (change per-commit)

Usage

In your workflow:

runs-on: cachekit  # ARC runner scale set label

In values-cachekit-runner-set.yaml:

containers:
  - name: runner
    image: ghcr.io/cachekit-io/runner:latest

Building

Push a tag to build and publish:

git tag v1.0.0
git push origin v1.0.0

Image is pushed to ghcr.io/cachekit-io/runner.

Updating

When base tools need updating (new Rust stable, new Python minor):

1. Update Dockerfile
2. Tag a new version
3. Update the image reference in values-cachekit-runner-set.yaml
4. helm upgrade the runner scale set