# Multi-repo Docker build template for tier-3 prep (e.g. state-hub + hub-core).
# Copy to: .forgejo/workflows/image.yaml and set PRIMARY_REPO + EXTRA_REPOS.
# Uses archive checkout (no actions/checkout; non-root runner has no git).
# Dockerfile must reference named contexts, e.g.:
#   COPY --from=hub_core_src pyproject.toml /tmp/hub-core/pyproject.toml
name: Build and Publish Multi-Context Image

on:
  push:
    branches:
      - main
    paths:
      - ".forgejo/workflows/image.yaml"
      - "Dockerfile"
  workflow_dispatch:

env:
  REGISTRY: forgejo.coulomb.social
  IMAGE_NAME: coulomb/REPLACE_ME
  DOCKER_HOST: tcp://127.0.0.1:2375
  # Space-separated coulomb/repo@context_name entries for extra build contexts.
  # Example: "coulomb/hub-core@hub_core_src"
  EXTRA_REPOS: "coulomb/hub-core@hub_core_src"

jobs:
  build-and-push:
    runs-on: container-build
    steps:
      - name: Build and push image
        env:
          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          set -eu
          REF="${GITHUB_SHA:-main}"
          mkdir -p buildctx "${HOME}/bin"
          wget -qO /tmp/primary.tar.gz \
            "https://forgejo.coulomb.social/${GITHUB_REPOSITORY}/archive/${REF}.tar.gz"
          tar xzf /tmp/primary.tar.gz -C buildctx --strip-components=1
          BUILD_ARGS=()
          for spec in ${EXTRA_REPOS}; do
            repo="${spec%@*}"
            ctx="${spec#*@}"
            extra_ref="${REF}"
            wget -qO "/tmp/${ctx}.tar.gz" \
              "https://forgejo.coulomb.social/${repo}/archive/${extra_ref}.tar.gz"
            mkdir -p "/tmp/ctx-${ctx}"
            tar xzf "/tmp/${ctx}.tar.gz" -C "/tmp/ctx-${ctx}" --strip-components=1
            BUILD_ARGS+=(--build-context "${ctx}=/tmp/ctx-${ctx}")
          done
          wget -qO- https://download.docker.com/linux/static/stable/x86_64/docker-27.3.1.tgz \
            | tar xz --strip-components=1 -C "${HOME}/bin" docker/docker
          export PATH="${HOME}/bin:${PATH}"
          echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" -u "${REGISTRY_USER}" --password-stdin
          SHORT="${REF:0:7}"
          IMAGE="${REGISTRY}/${IMAGE_NAME}"
          docker build "${BUILD_ARGS[@]}" \
            -t "${IMAGE}:latest" -t "${IMAGE}:main-${SHORT}" buildctx
          docker push "${IMAGE}:latest"
          docker push "${IMAGE}:main-${SHORT}"
          echo "pushed ${IMAGE}:latest and ${IMAGE}:main-${SHORT}"