action.yml

name: "Setup Docker Builder"
description: "Sets up a Docker multi-platform builder with GitHub Actions, including logging into GHCR and Docker Hub."
branding:
  color: "orange"
  icon: "arrow-up-circle"

inputs:
  ghcr_user:
    description: "The GitHub Container Registry user"
    required: false
  ghcr_token:
    description: "The GitHub Container Registry token"
    required: false
  docker_hub_user:
    description: "The Docker Hub user"
    required: false
  docker_hub_token:
    description: "The Docker Hub token"
    required: false

outputs:
  cache_from:
    description: "The cache_from value for docker/build-push-action"
    value: ${{ steps.helpers.outputs.cache_from }}
  cache_to:
    description: "The cache_to value for docker/build-push-action"
    value: ${{ steps.helpers.outputs.cache_to }}

runs:
  using: "composite"
  steps:
    - uses: docker/setup-qemu-action@v3
    - uses: crazy-max/ghaction-github-runtime@v3
    - uses: docker/setup-buildx-action@v3
    - uses: docker/login-action@v3
      if: ${{ inputs.ghcr_user && inputs.ghcr_token }}
      with:
        registry: ghcr.io
        username: ${{ inputs.ghcr_user }}
        password: ${{ inputs.ghcr_token }}
    - uses: docker/login-action@v3
      if: ${{ inputs.docker_hub_user && inputs.docker_hub_token }}
      with:
        username: ${{ inputs.docker_hub_user }}
        password: ${{ inputs.docker_hub_token }}
    - id: helpers
      shell: bash
      run: |
        if [[ "${{ github.actor }}" == "nektos/act" ]]; then
          echo "cache_from=" >> $GITHUB_OUTPUT
          echo "DOCKER_CACHE_FROM=" >> $GITHUB_ENV
          echo "cache_to=" >> $GITHUB_OUTPUT
          echo "DOCKER_CACHE_TO=" >> $GITHUB_ENV
        else
          echo "cache_from=type=gha" >> $GITHUB_OUTPUT
          echo "DOCKER_CACHE_FROM=type=gha" >> $GITHUB_ENV
          echo "cache_to=type=gha,mode=max" >> $GITHUB_OUTPUT
          echo "DOCKER_CACHE_TO=type=gha,mode=max" >> $GITHUB_ENV
        fi