GitHub Action で Docker マルチアーキテクチャ（x86_64 / arm64）ビルド

name: Publish Docker image

on:
  push:
    tags:
      - "v*"
  workflow_dispatch:

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-22.04

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Docker meta
        id: metadata
        uses: docker/metadata-action@v4
        with:
          images: username/repository-name
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}            

      - name: Login to Docker Hub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - # Add support for more platforms with QEMU (optional)
        # https://github.com/docker/setup-qemu-action
        name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@v2
        with:
          platforms: linux/amd64,linux/arm64

      - name: Build and Push to Docker Hub
        uses: docker/build-push-action@v2
        with:
          context: .
          builder: ${{ steps.buildx.outputs.name }}
          platforms: ${{ steps.buildx.outputs.platforms }}
          push: true
          tags: ${{ steps.metadata.outputs.tags }}
          labels: ${{ steps.metadata.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

# 再掲
- name: Login to Docker Hub
  uses: docker/login-action@v2
  with:
    username: ${{ secrets.DOCKERHUB_USERNAME }}
    password: ${{ secrets.DOCKERHUB_TOKEN }}