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
    # Publish semver tags as releases.
    tags:
      - v*.*.*
    paths:
      - .github/workflows/docker-publish.yml
      - components/datadog/apps/*/images/**
  pull_request:
    branches:
      - main
    paths:
      - .github/workflows/docker-publish.yml
      - components/datadog/apps/*/images/**

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


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

    strategy:
      fail-fast: false
      matrix:
        include:
          - app: dogstatsd
            image: dogstatsd
          - app: mutatedbyadmissioncontroller
            image: mutated
          - app: nginx
            image: http-client
          - app: nginx
            image: nginx-server
          - app: prometheus
            image: prometheus
          - app: redis
            image: redis-client
          - app: tracegen
            image: tracegen
          - app: npm-tools
            image: go-httpbin
          - app: npm-tools
            image: npm-tools

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      # 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@9614fae9e5c5eddabb09f90a270fcb487c9f7149 #3.3.0
        with:
          cosign-release: 'v1.13.1'


      # Workaround: https://github.com/docker/build-push-action/issues/461
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226

      # 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@343f7c4344506bcbf9b4de18042ae17996df046d
        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@dbef88086f6cef02e264edb7dbf63250c17cef6c
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/apps-${{ matrix.image }}

      # 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@4a13e500e55cf31b7a5d59a38ab2040ab0f42f56
        with:
          context: components/datadog/apps/${{ matrix.app }}/images/${{ matrix.image }}
          platforms: linux/amd64,linux/arm64
          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: ${{ github.event_name != 'pull_request' }}
        env:
          COSIGN_EXPERIMENTAL: "true"
        # This step uses the identity token to provision an ephemeral certificate
        # against the sigstore community Fulcio instance.
        run: echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign {}@${{ steps.build-and-push.outputs.digest }}