Pusher binary wrongly transitioned to target platform

[lionelfleury]

🐞 bug report

Affected Rule

Pusher binary wrongly transitioned to target platform. Instead of being run on exec one.

Is this a regression?

introduced by https://github.com/bazelbuild/rules_docker/commit/e48c7cc71773ab69abd0ee08ae47bafff4b5845a

Description

A clear and concise description of the problem...

Trying to push a container from another platform doesn't work if these are not exec compatible. Example: darwin/arm/v8 vs. linux/amd64

🔬 Minimal Reproduction

Any container_push rule cannot work on a darwin arm machine if building a linux/amd64 container.

bazel run <container_push target> --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64

This results in Exec format error.

🔥 Exception or Error

[your-runfiles-folder]/../io_bazel_rules_docker/container/go/cmd/pusher/pusher_/pusher: cannot execute binary file: Exec format error

🌍 Your Environment

Operating System:

Output of bazel version:

Rules_docker version:

Anything else relevant?