speculos-builder.yml

# Build speculos-builder and push the resulting docker image to GitHub Packages

name: Speculos Builder

on:
  workflow_dispatch:
  push:
    branches:
      - master
    paths:
      - .github/workflows/speculos-builder.yml
      - build.Dockerfile
  pull_request:
    branches:
      - master
    paths:
      - .github/workflows/speculos-builder.yml
      - build.Dockerfile

jobs:
  build:
    name: Build and push speculos-builder image
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: speculos-builder-2c-arm64-ubuntu_2404
    runs-on: ${{ matrix.runner }}
    permissions:
      packages: write

    steps:
      - name: Prepare
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

          if [[ "${{ github.event_name }}" == 'push' && "${{ github.ref }}" == 'refs/heads/master' ]]; then
             PUSH_FLAG='true'
          else
             PUSH_FLAG='false'
          fi
          echo "PUSH_FLAG=${PUSH_FLAG}" >> $GITHUB_ENV

      - name: Clone
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push speculos-builder to GitHub Packages by digest
        uses: docker/build-push-action@v6
        id: build
        with:
          file: build.Dockerfile
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=ghcr.io/ledgerhq/speculos-builder,push-by-digest=true,name-canonical=true,push=${{ env.PUSH_FLAG }}

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
    needs:
      - build
    runs-on: ubuntu-latest
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create --tag ghcr.io/ledgerhq/speculos-builder:latest  $(printf 'ghcr.io/ledgerhq/speculos-builder@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ghcr.io/ledgerhq/speculos-builder:latest