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Image push fails on Google Artifact Registry

See original GitHub issue

Behaviour

Steps to reproduce this issue

Have a project configured on GCP with a Docker Artifact Registry configured
Set up a service account in the project with write access to the registry
Execute the GitHub Workflow pasted below

Expected behaviour

The image should be built and pushed to the Google Artifact Registry configured.

Actual behaviour

The image push fails with the following error.

📣 Buildx version: 0.4.2
🏃 Starting build...
/usr/bin/docker buildx build --label org.opencontainers.image.created=2020-09-15T14:40:23Z --label org.opencontainers.image.source=git://github.com/<redacted>.git --label org.opencontainers.image.version=19 --label org.opencontainers.image.revision=<redacted> --label org.opencontainers.image.licenses= --tag northamerica-northeast1-docker.pkg.dev/<redacted>:19 --iidfile /tmp/docker-build-push-2Wh0EC/iidfile --file ./Dockerfile --push .
time="2020-09-15T14:40:50Z" level=warning msg="invalid non-bool value for BUILDX_NO_DEFAULT_LOAD: "
#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 348B 0.0s done
#1 DONE 0.0s

[...]

#15 exporting to image
#15 exporting layers
#15 exporting layers 5.1s done
#15 exporting manifest sha256:d5e9c868a04637edc4989104f2acc8410fe2d246374b51e946044534c40f2bdb 0.0s done
#15 exporting config sha256:8552d666e2b855b8f4f484188214df37c4a643cef92b50d228f30f17a23c7fd7 done
#15 pushing layers
#15 pushing layers 4.8s done
#15 ERROR: failed commit on ref "layer-sha256:5e922235e3dc435811ea3b2f5f1ef3f73ee042acadb77b51acf525f9cce130e2": invalid content digest in response: invalid checksum digest format
------
 > exporting to image:
------
failed to solve: rpc error: code = Unknown desc = failed commit on ref "layer-sha256:5e922235e3dc435811ea3b2f5f1ef3f73ee042acadb77b51acf525f9cce130e2": invalid content digest in response: invalid checksum digest format

Configuration

Repository and project are private.

name: Cloud Run

on:
  push:
    branches:
      - master
  pull_request:

env:
  DOCKER_IMAGE: foo
  PROJECT_ID: bar
  REGION: northamerica-northeast1
  REPOSITORY_ID: foobar

jobs:
  build-tag-push:
    name: Build, tag, and push Docker image
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Prepare
        id: prep
        run: |
          VERSION="${{ github.run_number }}"
          REGISTRY="${REGION}-docker.pkg.dev"
          REPOSITORY="${REGISTRY}/${PROJECT_ID}/${REPOSITORY_ID}"
          TAGS="${REPOSITORY}/${DOCKER_IMAGE}:${VERSION}"
          echo ::set-output name=registry::${REGISTRY}
          echo ::set-output name=version::${VERSION}
          echo ::set-output name=tags::${TAGS}
          echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to GCR
        uses: docker/login-action@v1
        with:
          registry: ${{ steps.prep.outputs.registry }}
          username: _json_key
          password: ${{ secrets.GCP_SA_KEY }}

      - name: Build and push image
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: ${{ steps.prep.outputs.tags }}
          labels: |
            org.opencontainers.image.created=${{ steps.prep.outputs.created }}
            org.opencontainers.image.source=${{ github.repositoryUrl }}
            org.opencontainers.image.version=${{ steps.prep.outputs.version }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.licenses=${{ github.event.repository.license.name }}