00-github-workflow-for-building-multi-platform-images.md

Assets for Building a multi-platform Docker base image with GitHub Actions.

01-docker-export-types.csv

02-docker-registry.yml

jobs:
  build-image:
    runs-on: ubuntu-latest
    services:
      registry:
        image: registry:2
        ports:
          - 5000:5000
    steps:
      - uses: docker/setup-buildx-action@v1
        with:
          driver-opts: network=host

03-build.yml

name: Build Docker Image

on:
  push:
    branches:
      - "**"

jobs:
  build-image:
    runs-on: ubuntu-latest
    env:
      image: "ghcr.io/${{ github.repository }}"
      archive: "docker-image.tar"
    steps:
      - uses: docker/setup-buildx-action@v1
      - uses: docker/setup-qemu-action@v1
      - uses: docker/build-push-action@v2
        with:
          outputs: "type=oci,dest=${{ env.archive }}"
          platforms: linux/amd64,linux/arm64,linux/arm/v7
      - name: Upload Docker Image as pipeline artifact
        uses: actions/upload-artifact@v2
        with:
          path: "${{ env.archive }}"
          name: "${{ env.archive }}"
          retention-days: 7

04-push.yml

name: Push Docker Image To Registry

on:
  workflow_run:
    workflows:
      - Build Docker Image
    types:
      - completed

jobs:
  push-image-on-success:
    runs-on: ubuntu-latest
    if: github.event.workflow_run.conclusion == 'success'
    env:
      image: "ghcr.io/${{ github.repository }}"
      archive: "docker-image.tar"
    steps:
      - uses: actions/checkout@v2
      - name: Download Docker Image from build workflow
        uses: dawidd6/action-download-artifact@v2
        with:
          workflow: build.yml
          name: "${{ env.archive }}"
      - name: Log in to GitHub Container Registry as actor
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: "${{ github.repository_owner }}"
          password: "${{ secrets.GHCR_PAT }}"
      - id: commit
        uses: pr-mpt/actions-commit-hash@v1
        with:
          commit: ${{ github.event.workflow_run.head_sha }}
          prefix: "sha-"
      - uses: pr-mpt/actions-push-oci-archive-to-registry@v1
        with:
          archive: ${{ env.archive }}
          tag: "${{ steps.commit.outputs.short }}"
          image: "ghcr.io/${{ github.repository }}"