[spurin]

It would be possible to offload the caching to Docker Build Cloud transparently, it’s part of the Docker subscription service, every account gets free minutes - 50 free minutes a month so depending on usage, you may be able to get this at zero cost.

With this approach, you’d use buildx and remotely, they would manage and maintain cache amongst other benefits.

It does require a credit card signup (which takes $0 to mitigate fraud). Full transparency, I’m a Docker Captain and helped test this whilst it was called Hydrobuild.