package.yml

name: Publish to ghcr.io

on:
  push:
    tags:
      - '*'

env:
  REGISTRY: ghcr.io  # default is docker.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  ghcr-releaser:
    name: Release container images
    runs-on: ubuntu-latest
    permissions:
      packages: write  # required to write to container registry
    strategy:
      fail-fast: true
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
    steps:
      -
        name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
      -
        name: Set Variables used in build-args for docker build
        run: |
          echo "VAULTPAL_COMMIT=$(git rev-parse --short "$GITHUB_SHA")" >> $GITHUB_ENV
          echo "VAULTPAL_VERSION=${GITHUB_REF#refs/*/}" >> "$GITHUB_ENV"
          echo "VAULTPAL_BUILD_DATE=$(date +'%Y-%m-%dT%H:%M:%S')" >> "$GITHUB_ENV"
      -
        name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v2
        with:
          # since we run platform specific builds in parallel, we only need the current platform
          platforms: ${{ matrix.platform }}
      -
        name: Set up Docker Buildx for Multiple platform builds
        uses: docker/setup-buildx-action@v2
      -
        name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          #  You can use the ${{ github.actor }} context to automatically use the username of the user that triggered the workflow run.
          username: ${{ github.actor }}
          # You can use the automatically-generated GITHUB_TOKEN secret for the password
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Build docker image
        id: build # so we can reference this step as ${{ steps.build.outputs.digest }} in export step
        uses: docker/build-push-action@v4
        with:
          platforms:  ${{ matrix.platform }}
          context: .
          push: false # push later
          # don't specify 'tags' here (error "get can't push tagged ref by digest")
          # tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          # provenance? See GitHub Action produces unknown architecture and OS: https://github.com/docker/build-push-action/issues/820
          provenance: false
          build-args: |
            VAULTPAL_COMMIT=${{ env.VAULTPAL_COMMIT }}
            VAULTPAL_VERSION=${{ env.VAULTPAL_VERSION }}
            VAULTPAL_BUILD_DATE=${{ env.VAULTPAL_BUILD_DATE }}
          # capture output for export and upload image digests
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},push-by-digest=true,name-canonical=true,push=true
      -
        name: Export image digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/${digest#sha256:}"
      -
        name: Upload image digest
        uses: actions/upload-artifact@v3
        with:
          name: digests
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  # dedicated manifest merge job which runs after all platform specific build jobs are finished
  # see https://docs.docker.com/build/ci/github-actions/multi-platform/
  # see https://github.com/docker/build-push-action/issues/846
  merge-manifests:
    runs-on: ubuntu-latest
    needs:
      - ghcr-releaser
    steps:
      -
        name: Download image digests
        uses: actions/download-artifact@v3
        with:
          name: digests
          path: /tmp/digests
      -
        name: Set up Docker Buildx # but no need for QEMU in this job
        uses: docker/setup-buildx-action@v2
      -
        name: Extract docker metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
      -
        name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@sha256:%s ' *)
      -
        name: Inspect and test new multi-platform image
        run: |
          docker buildx imagetools inspect ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }}
          docker run --rm ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.meta.outputs.version }} version