Draupnir/.github/workflows/ghcr-release.yml

# SPDX-FileCopyrightText: 2026 Catalan Lover <catalanlover@protonmail.com>
#
# SPDX-License-Identifier: CC0-1.0

name: "GHCR - Release"

on:
  release:
    types: [published]

env:
  PLATFORMS: linux/amd64,linux/arm64
  IMG_SOURCE: https://github.com/${{ github.repository }}

jobs:
  ghcr-release:
    runs-on: ubuntu-latest
    permissions:
      id-token: write
      packages: write
      contents: read
      attestations: write
      artifact-metadata: write
    steps:
      - name: Check out
        uses: actions/checkout@v6
        with:
          fetch-depth: 0
          fetch-tags: true
      - name: Get release tag
        id: release_version
        run: echo "release_version=${GITHUB_REF#refs/*/}" >> $GITHUB_OUTPUT
      - name: Set lowercase image owner
        id: image_owner
        run:
          echo "image_owner=$(echo '${{ github.repository_owner }}' | tr
          '[:upper:]' '[:lower:]')" >> $GITHUB_OUTPUT

      # Needed for multi platform builds
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v4
        with:
          platforms: ${{ env.PLATFORMS }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Log in to GHCR
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push image to GHCR
        id: push_ghcr
        uses: docker/build-push-action@v7
        with:
          context: .
          file: ./Dockerfile
          platforms: ${{ env.PLATFORMS }}
          push: true
          # Shared Buildx cache scope reused by all container image workflows.
          # Keep the scope name aligned across workflows to maximize cache hits.
          cache-from: type=gha,scope=draupnir-container-build
          cache-to: type=gha,scope=draupnir-container-build,mode=max
          labels: |
            org.opencontainers.image.source=${{ env.IMG_SOURCE }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.version=${{ github.ref_name }}
            org.opencontainers.image.licenses=Apache-2.0
          sbom: true
          tags: |
            ghcr.io/${{ steps.image_owner.outputs.image_owner }}/draupnir:${{ steps.release_version.outputs.release_version }}

      - name: Attest pushed image
        id: attest
        uses: actions/attest@v4
        with:
          subject-name:
            ghcr.io/${{ steps.image_owner.outputs.image_owner }}/draupnir
          subject-digest: ${{ steps.push_ghcr.outputs.digest }}
          push-to-registry: true