docker-publish.yml

name: Docker

# This workflow uses actions that are not certified by GitHub.
# They are provided by a third-party and are governed by
# separate terms of service, privacy policy, and support
# documentation.

on:
  push:
    branches: [ "main" ]
    tags: [ "v*.*.*" ]
  pull_request:
    branches: [ "main" ]
  schedule:
    # Every day at 13:00 UTC (~8:00am ET)
    - cron: "0 13 * * *"

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}


jobs:
  build:
    if: github.event_name != 'schedule'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      # This is used to complete the identity challenge
      # with sigstore/fulcio when running outside of PRs.
      id-token: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      # Install cosign
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
        with:
          cosign-release: 'v2.2.4'

      # Set up BuildKit Docker container builder to be able to build
      # multi-platform images and export cache
      # https://github.com/docker/setup-buildx-action
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0

      # Login against registry
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Check if pushed tag is latest semver tag
        id: latest_tag
        shell: bash
        run: |
          if [[ "${GITHUB_REF_TYPE}" != "tag" ]]; then
            echo "is_latest=false" >> "${GITHUB_OUTPUT}"
            exit 0
          fi

          latest="$(git tag --list 'v*.*.*' --sort=-version:refname | head -n1)"
          if [[ "${GITHUB_REF_NAME}" == "${latest}" ]]; then
            echo "is_latest=true" >> "${GITHUB_OUTPUT}"
          else
            echo "is_latest=false" >> "${GITHUB_OUTPUT}"
          fi

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=main,enable=${{ github.ref == 'refs/heads/main' }}
            type=raw,value=latest,enable=${{ github.ref_type == 'tag' && steps.latest_tag.outputs.is_latest == 'true' }}
            type=semver,pattern=v{{major}},value=${{ github.ref_name }},enable=${{ github.ref_type == 'tag' }}
            type=semver,pattern=v{{major}}.{{minor}},value=${{ github.ref_name }},enable=${{ github.ref_type == 'tag' }}
            type=semver,pattern=v{{version}},value=${{ github.ref_name }},enable=${{ github.ref_type == 'tag' }}

      # Build and push Docker image with Buildx
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      # Sign the resulting Docker image digest.
      # This will only write to the public Rekor transparency log when the Docker
      # repository is public to avoid leaking data.  If you would like to publish
      # transparency data even for private images, pass --force to cosign below.
      # https://github.com/sigstore/cosign
      - name: Sign the published Docker image
        if: ${{ github.event_name != 'pull_request' }}
        env:
          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

  daily-main:
    if: github.event_name == 'schedule'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout main branch
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: main

      - name: Install cosign
        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
        with:
          cosign-release: 'v2.2.4'

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0

      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push no-cache main image
        id: build-main
        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
        with:
          context: .
          pull: true
          no-cache: true
          push: true
          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:main

      - name: Sign published main image
        env:
          TAGS: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:main
          DIGEST: ${{ steps.build-main.outputs.digest }}
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

  daily-release:
    if: github.event_name == 'schedule'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout repository with tags
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Resolve latest release tag
        id: latest_release
        shell: bash
        run: |
          latest="$(git tag --list 'v*.*.*' --sort=-version:refname | head -n1)"
          if [[ -z "${latest}" ]]; then
            echo "tag=" >> "${GITHUB_OUTPUT}"
            echo "tags=" >> "${GITHUB_OUTPUT}"
            exit 0
          fi

          major="$(echo "${latest}" | sed -E 's/^v([0-9]+)\..*$/v\1/')"
          major_minor="$(echo "${latest}" | sed -E 's/^v([0-9]+\.[0-9]+)\..*$/v\1/')"
          image="${REGISTRY}/${IMAGE_NAME}"

          {
            echo "tag=${latest}"
            echo "tags<<EOF"
            echo "${image}:latest"
            echo "${image}:${major}"
            echo "${image}:${major_minor}"
            echo "${image}:${latest}"
            echo "EOF"
          } >> "${GITHUB_OUTPUT}"

      - name: Stop if no release tags exist
        if: steps.latest_release.outputs.tag == ''
        run: |
          echo "No release tag matching v*.*.* found; skipping daily release image build."

      - name: Checkout latest release tag
        if: steps.latest_release.outputs.tag != ''
        run: git checkout --detach "${{ steps.latest_release.outputs.tag }}"

      - name: Install cosign
        if: steps.latest_release.outputs.tag != ''
        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
        with:
          cosign-release: 'v2.2.4'

      - name: Set up Docker Buildx
        if: steps.latest_release.outputs.tag != ''
        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0

      - name: Log into registry ${{ env.REGISTRY }}
        if: steps.latest_release.outputs.tag != ''
        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push no-cache latest release image
        if: steps.latest_release.outputs.tag != ''
        id: build-release
        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
        with:
          context: .
          pull: true
          no-cache: true
          push: true
          tags: ${{ steps.latest_release.outputs.tags }}

      - name: Sign published latest release image
        if: steps.latest_release.outputs.tag != ''
        env:
          TAGS: ${{ steps.latest_release.outputs.tags }}
          DIGEST: ${{ steps.build-release.outputs.digest }}
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}