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Build on Blacksmith runners - #2

Merged
alandotcom merged 1 commit into
mainfrom
blacksmith
Aug 6, 2026
Merged

Build on Blacksmith runners#2
alandotcom merged 1 commit into
mainfrom
blacksmith

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@alandotcom

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Context

GitHub Actions is having an outage. The monorepo already runs its Docker builds on Blacksmith
(.github/workflows/donor-os-backend-docker.yml), so this brings the Postgres image build onto
the same setup.

What this PR changes

Three lines in .github/workflows/build.yml:

  • runs-on: ubuntu-latest -> blacksmith-4vcpu-ubuntu-2404
  • docker/setup-buildx-action -> useblacksmith/setup-docker-builder@v2.1.0
  • docker/build-push-action -> useblacksmith/build-push-action@v2.3.0

cache-from/cache-to: type=gha are dropped. That cache is not rerouted to Blacksmith's
colocated cache, and the Blacksmith builder handles layer caching itself.

Nothing else changes: same triggers, same tags, same PR-builds-without-publishing behaviour.

How to test

Merge and watch the run publish ghcr.io/fountain-bio/postgres:17. The workflow YAML parses.

Rollout / Risk notes

  • Merging publishes an image and deploys nothing. Railway services move when their Source Image
    is changed.
  • If the outage is in the Actions control plane rather than the hosted-runner pool, Blacksmith
    jobs are still dispatched through GitHub and will queue either way.

🤖 Generated with Claude Code

https://claude.ai/code/session_014TnDappY3DcbhiFS1BgKGW

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014TnDappY3DcbhiFS1BgKGW
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@alandotcom
alandotcom merged commit 7393bca into main Aug 6, 2026
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