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Preview environments

Preview environments CI on GitHub Actions

Every pull request waits on a full environment build and deploy.

12m → 3m
Preview ready

Every pull request waits on a full environment build and deploy.

Why it happens

Preview builds do not reuse the layer cache or the base infrastructure between pull requests.

What to change

  1. Share one warm Docker layer cache across all preview builds
  2. Deploy only the changed services rather than the entire stack
  3. Tear down previews automatically on close so cost does not accumulate

Preview environments on runnerhut

yaml
jobs:
  preview:
    runs-on: runnerhut-8vcpu-ubuntu-2404
    steps:
      - uses: actions/checkout@v4
      - uses: runnerhut/setup-buildx@v1
      - run: docker buildx build --push -t ghcr.io/acme/api:pr-${{ github.event.number }} .
A working starting point

The only runnerhut-specific line is `runs-on: runnerhut-8vcpu-ubuntu-2404`. Everything else is standard GitHub Actions — the same actions, the same secrets and the same permissions model you use today.

Your next build could be twice as fast, at half the price

Start free. Migrating away is the same one line, and we publish that diff too.

Start buildingSee pricing

Related

Terraformterraform init downloads every provider on every run.PulumiPlugin and dependency installation runs before every preview.KubernetesSpinning up a kind or k3s cluster takes minutes before tests start.HelmChart dependency updates and linting run cold every time.