Using Google Container Registry, Docker Buildx, and GitHub Actions

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Today, I was trying to integrate the docker/build-push-action with Google Container Registry (GCR). I was able to get the build working, but I was unable to push the image to GCR due to authentication issues. The solution involved the following.

  1. Using the google-github-actions/auth action to authenticate with Google Cloud.
  2. Calling gcloud auth configure-docker --quiet gcr.io to configure the Docker CLI to use the Google Cloud credentials.

The workflow looks like this.

- name: Setup auth
  id: "auth"
  uses: "google-github-actions/[email protected]"
  with:
    workload_identity_provider: ${{ secrets.WORKLOAD_IDENTITY_PROVIDER }}
    service_account: "[email protected]${{ secrets.GOOGLE_CLOUD_PROJECT }}.iam.gserviceaccount.com"
- name: Setup docker
  uses: docker/setup-buildx-[email protected]
- name: Authenticate docker
  run: |
    gcloud auth configure-docker --quiet gcr.io
- name: Build and push
  uses: docker/build-push-[email protected]
  with:
    context: .
    push: true
    tags: ${{ env.IMAGE }}
    cache-from: type=gha
    cache-to: type=gha,mode=max

I was unable to get the cache working with GCR. I’m not sure if it’s a bug or if I’m doing something wrong.

IAM Role

I also created a custom role based upon Storage Legacy Bucket Writer to add to the [email protected] service account.

Custom role for pushing images to gcr.io

Custom role for pushing images to gcr.io

This includes the following permissions.

  • storage.buckets.get
  • storage.multipartUploads.abort
  • storage.multipartUploads.create
  • storage.multipartUploads.list
  • storage.multipartUploads.listParts
  • storage.objects.create
  • storage.objects.delete
  • storage.objects.list

And it works! 🎉

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