github-package-alpine.yml

# for Privoxy
name: GitHub Package Alpine

# 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:
  workflow_dispatch:
  schedule:
    - cron: '15 05 * * *'
  release:
    types: [published]
  push:
    branches: [ "develop", "main" ]
    paths-ignore:
      - '.github/**'
      - .gitignore
      - '*.md'
      - '.*'
      - '.LICENSE'
      - 'examples'
  #   # Publish semver tags as releases.
    # tags: [ 'v*.*.*' ]

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ghcr.io
  # name of image
  IMAGE: privoxy
  # github.repository as <account>/<repo>
  IMAGE_NAME: tmknight/privoxy
  # cosign version
  COSIGN_VER: 'v2.1.1'
  # Build args
  CONTEXT: .
  DISTRO: alpine
  RELEASE: stable
  BUILD_ARGS: |
    "PRIVOXY_VER=3.0.34"
    "ALPINE_VER=${{ vars.ALPINE_VER }}"

jobs:
  build:

    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@v3

      # Install the cosign tool except on PR
      # https://github.com/sigstore/cosign-installer
      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@v3 #v3.1.1
        with:
          cosign-release: ${{ env.COSIGN_VER }}

      # Setup QEMU for multi-arch
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2
        with:
          platforms: amd64,arm64

      # Workaround: https://github.com/docker/build-push-action/issues/461
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@v2

      # Login against a Docker registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v2
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch,enable=${{ github.event_name != 'schedule' }}
            type=ref,event=tag
            type=raw,enable=${{ github.event_name == 'schedule' }},value=latest
            type=raw,enable=true,value=${{ env.DISTRO }}-${{ env.RELEASE }}
            type=raw,enable=true,value=${{ env.DISTRO }}

      # Build and push Docker image with Buildx (don't push on PR)
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v4
        with:
          context: ${{ env.CONTEXT }}
          platforms: linux/amd64,linux/arm64
          file: docker/${{ env.DISTRO }}/${{ env.RELEASE }}/${{ env.IMAGE }}.dockerfile
          build-args: ${{ env.BUILD_ARGS }}
          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 except on PRs.
      # 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}