runtime-builder-image.yml

# NOTE: This name appears in GitHub's Checks API and in workflow's status badge.
name: runtime-builder-image

on:
  push:
    # XXX: ideally on main branches we would build the image only if there are changes in the
    # 'docker/' directory (as we do in pull_requests). However, this doesn't work when pushing a new
    # 'stable/*' branch - the build on a new branch does not trigger unless there are changes
    # compared to main on the filtered path.
    # If this is ever fixed, or per branch filters are possible, bring back the path filter to only
    # build the image when there are changes within 'docker/' directory.
    branches:
      - main
      - stable/*
  # Or when a pull request event occurs for a pull request against one of the matched branches and at least
  # one modified file matches the configured paths.
  #
  # NOTE: We use this to be able to easily test Docker image changes.
  pull_request:
    branches:
      - main
      - stable/*
    paths:
      - docker/runtime-builder/**
  # Or every day at 04:00 UTC (for the default/main branch).
  schedule:
    - cron: "0 4 * * *"

# Cancel in-progress jobs on same branch.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:

  build-runtime-builder:
    # NOTE: This name appears in GitHub's Checks API.
    name: build-runtime-builder
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          # Check out pull request's HEAD commit instead of the merge commit.
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Determine tag name
        id: determine-tag
        uses: ./.github/actions/determine-tag
      - name: Determine Oasis Core Commit Ref
        id: determine-oasis-core-commit-ref
        uses: ./.github/actions/oasis-core-commit-ref
      - name: Determine Rust Toolchain version
        id: determine-rust-version
        uses: ./.github/actions/rust-version

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to ghcr.io
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: "Rebuild oasisprotocol/runtime-builder:${{ steps.determine-tag.outputs.tag }}"
        uses: docker/build-push-action@v4
        with:
          context: docker/runtime-builder
          file: docker/runtime-builder/Dockerfile
          tags: ghcr.io/oasisprotocol/runtime-builder:${{ steps.determine-tag.outputs.tag }}
          pull: true
          push: true
          build-args: |
            OASIS_CORE_COMMIT=${{ steps.determine-oasis-core-commit-ref.outputs.ref }}
            RUST_NIGHTLY_VERSION=${{ steps.determine-rust-version.outputs.version }}
          labels: |
            org.opencontainers.image.source=${{ github.event.repository.html_url }}
            org.opencontainers.image.created=${{ steps.determine-tag.outputs.created }}
            org.opencontainers.image.revision=${{ github.sha }}

      - name: Prune old ghcr.io/oasisprotocol/runtime-builder images
        uses: vlaurin/action-ghcr-prune@v0.5.0
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          organization: oasisprotocol
          container: runtime-builder
          keep-younger-than: 7 # days
          keep-last: 2
          prune-untagged: true
          prune-tags-regexes: ^pr-