buildx failed with: ERROR: failed to solve: failed to push ghcr.io/acdh-oeaw/openatlas-discovery/tests/openatlas-discovery:f754feeef495eafe6cf00721eae10fe2c312ff4e: unexpected status from POST request to https://ghcr.io/v2/acdh-oeaw/openatlas-discovery/tests/openatlas-discovery/blobs/uploads/: 403 Forbidden

Process completed with exit code 1.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/cache/save@v3, actions/upload-artifact@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.