name: 'Docker composite action'
description: 'Set up Buildx and QEMU + Cache + Metadata + Build and push'

inputs:
  images:
    description: "List of Docker image slugs (eg. name/app)"
    required: true
  context:
    description: "Build's context is the set of files located in the specified PATH or URL. (default Git context)"
    required: false
  file:
    description: "Path to the Dockerfile. (default {context}/Dockerfile)"
    required: false
  platforms:
    description: "List of target platforms (eg. linux/amd64)"
    required: false
  cachekey:
    description: "Cache key for local cache. (default buildx-{github.repository.name})"
    required: false
    default: "buildx-${{ github.repository.name}}"
  push:
    description: "Push image to the registry"
    required: false
    default: "true"

runs:
  using: "composite"
  steps:
    -
      uses: actions/cache@v2
      with:
        path: /tmp/.buildx-${{ inputs.cachekey }}-cache
        key: ${{ runner.os }}-${{ inputs.cachekey }}-${{ github.sha }}
        restore-keys: |
          ${{ runner.os }}-${{ inputs.cachekey }}-
    -
      id: meta
      uses: docker/metadata-action@v3
      with:
        images: ${{ inputs.images }}
        tags: |
          type=schedule
          type=ref,event=branch
          type=semver,pattern={{version}}
          type=semver,pattern={{major}}.{{minor}}
          type=semver,pattern={{major}}
    -
      uses: docker/setup-qemu-action@v1
    -
      uses: docker/setup-buildx-action@v1
    -
      uses: docker/build-push-action@v2
      with:
        context: ${{ inputs.context }}
        file: ${{ inputs.file }}
        push: ${{ inputs.push }}
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        platforms: ${{ inputs.platforms }}
        cache-from: type=local,src=/tmp/.${{ inputs.cachekey }}-cache
        cache-to: type=local,dest=/tmp/.${{ inputs.cachekey }}-cache-new,mode=max
    -
      # Temp fix
      # https://github.com/docker/build-push-action/issues/252
      # https://github.com/moby/buildkit/issues/1896
      run: |
        rm -rf /tmp/.${{ inputs.cachekey }}-cache
        mv /tmp/.${{ inputs.cachekey }}-cache-new /tmp/.${{ inputs.cachekey }}-cache
      shell: bash