Building an image on one platform, and tagging it as another.

[randomairborne]

heya! I'm using the build-push-action, and I was wondering if it was possible to run the dockerfile on the host platform, but tag it for another platform? I have a build process that runs on x86_64 (because that's all github gives me), but produces an image which has an aarch64 executable. Does buildx support this?

[randomairborne]

https://docs.docker.com/reference/dockerfile/#from
You can use the --platform=$BUILDPLATFORM flag for the FROM directive.
This makes it possible.