docker-publish.yml

name: Docker publish

# Tag-based image release. Pushing a semver tag (e.g. v0.5.0) builds the
# operator image multi-arch, pushes it to GHCR under this repo's name, and
# signs it with cosign. This is the same shape as the legacy v1alpha1 release
# process, retargeted at ghcr.io/<owner>/<repo> via the built-in GITHUB_TOKEN
# (no Docker Hub secrets needed).
#
# Release order: push the tag FIRST (this builds ghcr.io/.../etcd-operator:<tag>),
# then publish the GitHub release for that tag — release-assets.yml renders the
# install manifests pointing at this image.

on:
  push:
    tags: [ 'v*.*.*' ]

env:
  REGISTRY: ghcr.io
  # github.repository is <owner>/<repo>, e.g. cozystack/etcd-operator
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build:
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      packages: write
      # Needed for the keyless cosign identity challenge (sigstore/fulcio).
      id-token: write

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

      - name: Install cosign
        uses: sigstore/cosign-installer@v3.5.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.3.0

      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@v3.2.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5.5.1
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          # Pin the published tag to the exact git ref (e.g. v0.5.0). This is
          # the SAME source release-assets.yml uses for the IMG it bakes into
          # the install manifest (its RELEASE_TAG is github.ref_name too), so
          # the image that ships and the image the manifest references are
          # provably identical. Don't rely on metadata-action's implicit
          # default: it also emits a moving `latest` and its default tag set is
          # easy to misread — explicit keeps the publish/manifest contract clear.
          tags: |
            type=raw,value=${{ github.ref_name }}

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          platforms: linux/amd64,linux/arm64
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Sign the published Docker image
        env:
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}