name: Publish Docker image

on:
  push:
    branches: [main]
    tags:
      - 'v*'
  workflow_dispatch:

permissions:
  contents: read
  packages: write

env:
  IMAGE_NAME: pichost

jobs:
  build-and-push:
    if: ${{ !contains(github.event.head_commit.message, '[skip docker]') }}
    runs-on: ubuntu-latest
    env:
      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
    steps:
      - name: Checkout
        uses: actions/checkout@v7

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Log in to Docker Hub
        if: env.DOCKERHUB_USERNAME != '' && env.DOCKERHUB_TOKEN != ''
        uses: docker/login-action@v3
        with:
          username: ${{ env.DOCKERHUB_USERNAME }}
          password: ${{ env.DOCKERHUB_TOKEN }}

      - name: Resolve image names
        id: images
        run: |
          names="ghcr.io/${OWNER}/${IMAGE_NAME}"
          if [ -n "${DOCKERHUB_USERNAME}" ]; then
            names="${names}
          ${DOCKERHUB_USERNAME}/${IMAGE_NAME}"
          fi
          {
            echo "list<<EOF"
            echo "${names}"
            echo "EOF"
          } >> "$GITHUB_OUTPUT"
        env:
          OWNER: ${{ github.repository_owner }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ steps.images.outputs.list }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=semver,pattern={{version}}
            type=semver,pattern=v{{version}}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max