Fail to generate ARM64 compliant docker image from Linux/aarch64 container

# 🐞 bug report

### Affected Rule

The issue is caused by the rule: py_image

### Is this a regression?

I cannot tell.

### Description

My Macbook M1 has a linux (aarch64 platform) docker container that has all of my project setup for bazel, and I do all development inside the container. Bazel py_image produced a tarball docker image file. Since it was built from the linux/aarch machine, I expected the tarball image to be aarch compliant. But its targeted platform is x86_64 (or amd64).

## 🔬 Minimal Reproduction

In WORKSPACE.bazel,

  

container_pull(

    name = "python_arm64",

    architecture = "arm64v8",

    digest = "sha256:6d55a17e24a29d204da7d5d62b7f90f9f88691e36a09add24a287dc10ec46bd1",

    registry = "index.docker.io",

    repository = "python:3.10",

)

  

In BUILD.bazel,

  

py_binary(

    name = "python_shell_simple",

    srcs = ["python_shell_simple.py"],

    main = "python_shell_simple.py",

    python_version = "PY3ONLY",

    srcs_version = "PY3ONLY",

    deps = [

        requirement("botocore"),

        requirement("boto3"),

    ],

)

  

Then run this command,
$ bazel build //batch/file_process:python_shell_simple_image.tar

Copy the tar file to host machine. In my case, Apple M1 macos' filesystem. Load the docker image.
$ docker load -i python_shell_simple_image.tar

Launch a new docker container.
docker run --rm -it bazel/batch/file_process:python_shell_simple_image

## 🔥 Exception or Error

**WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested**

## 🌍 Your Environment

**Operating System:**

  

Ubuntu linux/aarch64 container running in Macbook M1 Monterey MacOS.

  

**Output of `bazel version`:**

  

6.0.0

  

**Rules_docker version:**

  

v0.25.0

  

**Anything else relevant?**