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Weird, I’m doing the same thing (cacheFrom an ECR image). I can see that it is pulling the image, but it doesn’t seem to actually do anything with it. The docker build still installs npm packages, etc - no cached layers are used.

Does it cache anything for you?

Yeah. So when I was using awsx and ecr to call buildAndPush, it was doing that. When I switched to using the pulumi docker library explicitly as you see in the example above, it worked. Works in the GitHub action too <@U0556SAN0FJ> 

There is an example here of how to do it that worked for me: <https://www.pulumi.com/registry/packages/docker/api-docs/image/#docker-image-build-using-caching-with-aws-elastic-container-registry|https://www.pulumi.com/registry/packages/docker/api-docs/image/#docker-image-build-using-caching-with-aws-elastic-container-registry>