name: Release

# Build and publish a multi-arch image to GitHub Container Registry (GHCR)
# whenever a version tag is pushed (e.g. v1.1.2). Lets users run a prebuilt
# image — including on Raspberry Pi (arm64) — without building locally.

on:
  push:
    tags: ["v*"]

permissions:
  contents: read
  packages: write

jobs:
  image:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Compute lowercase image name
        id: img
        run: echo "name=ghcr.io/${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"

      - uses: docker/setup-qemu-action@v3
      - uses: docker/setup-buildx-action@v3

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

      - name: Docker metadata (tags & labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ steps.img.outputs.name }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=latest

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