Add multi platforms support for RepoOutDir

[TrevorTaoARM]

Add multi-platform output dir support for
arm64 and other platforms, which is used in
archive, package(deb, rpm), docker
build actions.

Signed-off-by: TrevorTaoARM trevor.tao@arm.com

[istio-policy-bot]

😊 Welcome @TrevorTaoARM! This is either your first contribution to the Istio release-builder repo, or it's been
awhile since you've been here.

You can learn more about the Istio working groups, code of conduct, and contributing guidelines
by referring to Contributing to Istio.

Thanks for contributing!

Courtesy of your friendly welcome wagon.

[istio-testing]

Hi @TrevorTaoARM. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[howardjohn]

I am fine doing this short term but I think for Istio official builds we would probably only be doing both ARM and AMD at once, so we may need more work there in that regard

[howardjohn]

Actually this would mean that users on non-linux/amd64 can no longer build a proper release. For example, someone running on OSX now gets a osx build which is not what we want. The build platform != target platform IMO

[ericvn]

Doing some testing with MacOS as John mentioned, but running into another issue that I need to fix first :(.