name: Publish Docker image

on:
  push:
    branches:
      - master
  release:
    types: [published]

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
      attestations: write
      id-token: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract version from shard.yml
        id: extract_version
        run: |
          VERSION=$(grep '^version:' shard.yml | cut -d ' ' -f 2)
          echo "RELEASE_TAG=$VERSION" >> $GITHUB_ENV

      - name: Set tags
        id: set_tags
        run: |
          if [[ "${{ github.event_name }}" == "release" ]]; then
            echo "TAGS=latest,${{ env.RELEASE_TAG }}" >> $GITHUB_ENV
          else
            echo "TAGS=latest" >> $GITHUB_ENV
          fi

      - name: Build and push image
        id: push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          platforms: linux/amd64,linux/arm64
          tags: sjdonado/bit:${{ env.TAGS }}

      - name: Attest
        uses: actions/attest-build-provenance@v1
        id: attest
        with:
          subject-name: sjdonado/bit
          subject-digest: ${{ steps.push.outputs.digest }}