There's been a recent Launch HN of Depot.dev [1] - I've integrated it quickly into my GitHub Actions workflow and it's blazingly fast (13x speedups for me). It also was a drop-in replacement since I was using Docker Bake and Docker Action and Depot mimics that almost fully (except SBOM and provenance bits). It also works with Google Cloud Workload Identity Federation so image pushes to Artifact Registry didn't need any tweaking.

[1] https://news.ycombinator.com/item?id=34898253

Disclaimer: not affiliated, a happy paying customer.