action.yml

name: 'Build and push Docker image'
description: 'Composite action to build and push a Docker image to a registry.'

inputs:
  context:
    description: "Build's context is the set of files located in the specified PATH or URL"
    required: true
    default: .
  file:
    description: "Path to the Dockerfile"
    required: true
    default: ./Dockerfile
  image:
    description: "Name of the Docker image"
    required: true
    default: ${{ github.repository }}
  registry:
    description: "Address of the Docker registry"
    required: true
    default: ghcr.io
  username:
    description: "Username for the Docker registry"
    required: true
    default: ${{ github.actor }}
  password:
    description: "Password for the Docker registry"
    required: true
  platforms:
    description: "Target platforms for the Docker image"
    required: true
    default: linux/amd64
  push:
    description: "Whether or not to push the image to the registry"
    required: true
    default: true

runs:
  using: "composite"
  steps:
    - uses: docker/setup-qemu-action@v2
    - uses: docker/setup-buildx-action@v2
    - uses: docker/metadata-action@v4
      id: meta
      with:
        images: ${{ inputs.registry }}/${{ inputs.image }}
        tags: |
          type=ref,event=branch
          type=ref,event=pr
          type=semver,pattern={{version}}
          type=semver,pattern={{major}}.{{minor}}
    # (A) push = true => push image and cache to registry
    - uses: docker/login-action@v2
      if: ${{ inputs.push == 'true' }}
      with:
        registry: ${{ inputs.registry }}
        username: ${{ inputs.username }}
        password: ${{ inputs.password }}
    - uses: docker/build-push-action@v3
      if: ${{ inputs.push == 'true' }}
      with:
        push: true
        context: ${{ inputs.context }}
        file: ${{ inputs.file }}
        platforms: ${{ inputs.platforms }}
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        cache-from: type=registry,ref=${{ inputs.registry }}/${{ inputs.image }}:buildcache
        cache-to: type=registry,ref=${{ inputs.registry }}/${{ inputs.image }}:buildcache,mode=max
    # (B) push = false => do not push image or cache to registry
    - uses: docker/build-push-action@v3
      if: ${{ inputs.push != 'true' }}
      with:
        push: false
        context: ${{ inputs.context }}
        file: ${{ inputs.file }}
        platforms: ${{ inputs.platforms }}
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}