UPGRADE.md

Upgrade notes

v1 to v2

• Input path is now called context for consistency with other Docker build tools
• path defaults to current git repository so checkout action is not required in a workflow
• Rename dockerfile input to file for consistency with other Docker build tools
• Rename always_pull input to pull for consistency with other Docker build tools
• Add builder input to be able to choose a builder instance through our setup-buildx action
• Add platforms input to support multi-platform builds
• Add allow input
• Add load input
• Add outputs input
• Add cache-from input (cache_froms removed)
• Add cache-to input
• Rename build_args input to build-args for consistency with other Docker build tools
• Add secrets input
• Review tags input
• Remove repository input. See Simple workflow for migration
• Remove username, password and registry inputs. Login support moved to docker/login-action repo
• Remove tag_with_sha, tag_with_ref, add_git_labels inputs. See Tags with ref and Git labels for migration
• Handle Git context
• Add digest output

Simple workflow

# v1
steps:
  -
    name: Checkout
    uses: actions/checkout@v2
  -
    name: Build and push Docker images
    uses: docker/build-push-action@v1
    with:
      username: ${{ secrets.DOCKER_USERNAME }}
      password: ${{ secrets.DOCKER_PASSWORD }}
      repository: myorg/myrepository
      always_pull: true
      build_args: arg1=value1,arg2=value2
      cache_froms: myorg/myrepository:latest
      tags: latest

# v2
steps:
  -
    name: Checkout
    uses: actions/checkout@v2
  -
    name: Set up Docker Buildx
    uses: docker/setup-buildx-action@v1
  -
    name: Login to DockerHub
    uses: docker/login-action@v1
    with:
      username: ${{ secrets.DOCKER_USERNAME }}
      password: ${{ secrets.DOCKER_PASSWORD }}
  -
    name: Build and push
    uses: docker/build-push-action@v2
    with:
      context: .
      pull: true
      push: true
      build-args: |
        arg1=value1
        arg2=value2
      cache-from: type=registry,ref=myorg/myrepository:latest
      cache-to: type=inline
      tags: myorg/myrepository:latest

Tags with ref and Git labels

# v1
steps:
  -
    name: Checkout
    uses: actions/checkout@v2
  -
    name: Build and push Docker images
    uses: docker/build-push-action@v1
    with:
      username: ${{ secrets.DOCKER_USERNAME }}
      password: ${{ secrets.DOCKER_PASSWORD }}
      repository: myorg/myrepository
      push: ${{ github.event_name != 'pull_request' }}
      tag_with_ref: true
      tag_with_sha: true
      add_git_labels: true

# v2
steps:
  -
    name: Checkout
    uses: actions/checkout@v2
  -
    name: Docker meta
    id: meta
    uses: docker/metadata-action@v3
    with:
      images: |
        myorg/myrepository
      tags: |
        type=ref,event=branch
        type=ref,event=pr
        type=semver,pattern={{version}}
        type=sha
  -
    name: Set up Docker Buildx
    uses: docker/setup-buildx-action@v1
  -
    name: Login to DockerHub
    if: github.event_name != 'pull_request'
    uses: docker/login-action@v1 
    with:
      username: ${{ secrets.DOCKER_USERNAME }}
      password: ${{ secrets.DOCKER_PASSWORD }}
  -
    name: Build and push
    uses: docker/build-push-action@v2
    with:
      context: .
      push: ${{ github.event_name != 'pull_request' }}
      tags: ${{ steps.meta.outputs.tags }}
      labels: ${{ steps.meta.outputs.labels }}