docker-release.yml

name: Build and publish multi-arch image to GHCR on release

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      tag:
        description: 'Docker image tag for manual build (e.g. 1.2.3 or latest)'
        required: true
        default: 'latest'

permissions:
  contents: read
  packages: write

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    name: Build and push Docker image
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Resolve image tag
        id: vars
        run: |
          if [[ "${{ github.event_name }}" == "release" ]]; then
            echo "tag=${{ github.event.release.tag_name }}" >> "$GITHUB_OUTPUT"
          else
            echo "tag=${{ inputs.tag }}" >> "$GITHUB_OUTPUT"
          fi

      - name: Set up QEMU (for multi-arch)
        uses: docker/setup-qemu-action@v3

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

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            # Semver tags (patch, minor, major) — only when tag looks like a version
            type=semver,pattern={{version}},value=${{ steps.vars.outputs.tag }},enable=${{ startsWith(steps.vars.outputs.tag, 'v') || contains(steps.vars.outputs.tag, '.') }}
            type=semver,pattern={{major}}.{{minor}},value=${{ steps.vars.outputs.tag }},enable=${{ startsWith(steps.vars.outputs.tag, 'v') || contains(steps.vars.outputs.tag, '.') }}
            type=semver,pattern={{major}},value=${{ steps.vars.outputs.tag }},enable=${{ startsWith(steps.vars.outputs.tag, 'v') || contains(steps.vars.outputs.tag, '.') }}
            # Always tag with the exact resolved value (e.g. v1.2.3 or 'latest')
            type=raw,value=${{ steps.vars.outputs.tag }}

      - name: Build and push (multi-arch)
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          push: true
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}