actions-runner

Custom GitHub Actions self-hosted runner image for mitigate-dev, published to ghcr.io/mitigate-dev/actions-runner.

It extends the official ARC runner (ghcr.io/actions/actions-runner) — so it stays compatible with the gha-runner-scale-set helm chart — and adds a build toolchain plus common -dev headers so native gem extensions (bigdecimal, psych, pg, nokogiri, ...) compile without each workflow installing them at job time.

The runner cluster that consumes this image lives in ci.mitigate.dev.

Build

Built and pushed automatically by .github/workflows/build.yml on every push to main, weekly (to pick up base-image and security updates), and on manual dispatch. Tags: latest and sha-<commit>.

Use

Reference it in the scale-set values (runner.yml in ci.mitigate.dev):

template:
  spec:
    containers:
      - name: runner
        image: ghcr.io/mitigate-dev/actions-runner:latest

Adding dependencies

Add packages to the apt-get install list in the Dockerfile, push to main, and the workflow rebuilds and publishes.