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Cross-platform docker images built with GitHub actions

I run a number of docker containers on a couple of Raspberry Pi 4's. These are running arm64 version of raspbian. To build the docker images for these servers I found it was easiest to use GitHub Actions and get that do do the hard work.

This is an base level example workflow that I use.

Assuming the root of your GitHub repository has a working Dockerfile. Create a file in .github/workflows, say 'build.yaml' with the following contents.

.github/workflows/build.yaml

name: Build Image Cross Platform

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]

jobs:
  build:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2

    # this is a simple way of using date and time to do versioning.
    - name: Modify scripts and get version
      id: version
      run: |
        output=$(date -u '+%Y%m%d%H%M%S')
        echo ::set-output name=date_version::$output

    - name: Set up QEMU
      uses: docker/setup-qemu-action@v1

    -
      name: Login to GitHub Container Registry
      uses: docker/login-action@v1 
      with:
        registry: ghcr.io
        username: ${{ github.repository_owner }}
        password: ${{ secrets.GITHUB_TOKEN }}
    -
      name: Set up Docker Buildx
      id: buildx
      uses: docker/setup-buildx-action@v1
    -
      name: Available platforms
      run: echo ${{ steps.buildx.outputs.platforms }}

    # here you can do additional steps

    - 
      name: Build and push
      uses: docker/build-push-action@v2.7.0
      with:
        context: ./
        file: ./Dockerfile
        platforms: linux/arm64, linux/amd64
        push: true
        tags: |
          ghcr.io/${{github.repository}}:latest
          ghcr.io/${{github.repository}}:${{steps.version.outputs.date_version}}

Under platforms you can list any compatible docker buildx platforms you need. The platforms will be printed in the action log when it is run. Currently these are:

  • linux/amd64
  • linux/arm64
  • linux/riscv64
  • linux/ppc64le
  • linux/s390x
  • linux/386
  • linux/mips64le
  • linux/mips64
  • linux/arm/v7
  • linux/arm/v6
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