GitHub Action to set up Docker Buildx
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About

GitHub Action to set up Docker Buildx.

This action will create and boot a builder that can be used in the following steps of your workflow if you're using buildx. By default, the docker-container builder driver will be used to be able to build multi-platform images and export cache thanks to the BuildKit container.

💡 See also:

Screenshot


Usage

Quick start

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Builder instance name
        run: echo ${{ steps.buildx.outputs.name }}
      -
        name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}

With QEMU

If you want support for more platforms you can use our setup-qemu action:

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v1
      -
        name: Available platforms
        run: echo ${{ steps.buildx.outputs.platforms }}

Install by default

Implemented with https://github.com/docker/buildx#setting-buildx-as-default-builder-in-docker-1903

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v2
      -
        uses: docker/setup-buildx-action@v1
        id: buildx
        with:
          install: true
      -
        name: Build
        run: |
          docker build . # will run buildx          

Customizing

inputs

Following inputs can be used as step.with keys

Name Type Description
version String Buildx version. (eg. v0.3.0, latest)
driver String Sets the builder driver to be used (default docker-container)
driver-opts CSV List of additional driver-specific options (eg. image=moby/buildkit:master)
buildkitd-flags String Flags for buildkitd daemon (since buildx v0.3.0)
install Bool Sets up docker build command as an alias to docker buildx (default false)
use Bool Switch to this builder instance (default true)
endpoint String Optional address for docker socket or context from docker context ls

CSV type must be a newline-delimited string

driver-opts: image=moby/buildkit:master
driver-opts: |
  image=moby/buildkit:master
  network=host  

outputs

Following outputs are available

Name Type Description
name String Builder instance name
platforms String Available platforms (comma separated)

environment variables

The following official docker environment variables are supported:

Name Type Default Description
DOCKER_CONFIG String ~/.docker The location of your client configuration files

Keep up-to-date with GitHub Dependabot

Since Dependabot has native GitHub Actions support, to enable it on your GitHub repo all you need to do is add the .github/dependabot.yml file:

version: 2
updates:
  # Maintain dependencies for GitHub Actions
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "daily"

Limitation

This action is only available for Linux virtual environments.