slinky/.github/workflows/publish-image.yml

name: Build and Publish Container Image

on:
  push:
    branches:
      - main
    tags:
      - 'v*'
  release:
    types: [published]
  workflow_dispatch: {}

permissions:
  contents: read
  packages: write

env:
  REGISTRY: ghcr.io

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Derive image name (lowercase owner)
        id: names
        run: |
          echo "OWNER_LC=${GITHUB_REPOSITORY_OWNER,,}" >> $GITHUB_ENV
          echo "IMAGE=${REGISTRY}/${GITHUB_REPOSITORY_OWNER,,}/slinky" >> $GITHUB_ENV

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

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.IMAGE }}
          tags: |
            type=ref,event=tag
            type=raw,value=latest,enable={{is_default_branch}}
            type=raw,value=v1

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