docker-node.yml

# Trinity Node - Docker Build & Push to GHCR
# Builds on push to main when source or Dockerfile changes

name: Build & Push Trinity Node

on:
  push:
    branches: [main]
    paths:
      - 'src/**'
      - 'build.zig'
      - 'build.zig.zon'
      - 'deploy/Dockerfile.node'
      - '.dockerignore'
  workflow_dispatch:

jobs:
  build-push:
    name: Build & Push Docker Image
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

      # The image is thin and copies a prebuilt binary, so the binary has to be
      # built here — same shape as the CLI workflow, which is the only one of
      # the two that has ever published anything.
      - name: Install Zig
        uses: mlugg/setup-zig@v2
        with:
          version: 0.15.2

      - name: Build Trinity Node
        run: |
          zig build -Dci=true -Doptimize=ReleaseFast
          mkdir -p docker-artifacts
          cp zig-out/bin/trinity-node docker-artifacts/trinity-node
          chmod +x docker-artifacts/trinity-node
          file docker-artifacts/trinity-node

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/build-push-action@v6
        with:
          context: .
          file: deploy/Dockerfile.node
          # amd64 only, deliberately. The binary is built once by the runner,
          # which is amd64, so an arm64 layer would carry an amd64 executable
          # and fail at exec — worse than not publishing it. arm64 needs either
          # a cross-compiled second binary (`zig build -Dtarget=aarch64-linux`)
          # or a matrix build; both are real work and neither has ever run here,
          # since this workflow has never produced an image at all.
          platforms: linux/amd64
          push: true
          tags: |
            ghcr.io/ghashtag/trinity-node:latest
            ghcr.io/ghashtag/trinity-node:${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max