Use x86_64 version of artifact tool for M1 macs (using Rosetta)

[dalemyers]

Fixes: #1006

There is no version of artifacttool which runs natively on an M1 mac (which uses Apple Silicon / ARM). This PR overrides the architecture to x86_64 on those macs so that the "intel" version is downloaded, which will run under Rosetta.

There are 2 alternatives:

1. artifacttool has an arm compatible version created - This is not possible as artifacttool is an internal Microsoft tool which does not have its source published.
2. The server could handle this change - It would not be able to tell between a request for the intel on, or really for an ARM one if/when it is available later.

• : Approach is signed off on the issue.
• : This PR has a corresponding issue open in the Repository.

[johnterickson]

@dalemyers to double-check, have you been able to verify this on your M1?

[dalemyers]

I'm actually trying as we speak, but my M1 for testing has some problems which are getting in the way. Will be a day or two before I can actually run it I suspect. However, in my testing beforehand, this definitely won't make things worse. (And I have confirmed that it works as expected on an intel mac).

[ansorod]

Hi @dalemyers I tested using your branch with a M1 processor but it didn't work, so I changed from amd64 to arm64 (M1 arch), rebuilt and azure can respond to M1 based requests. Would you consider adding arm64?

[dalemyers]

Ah, that's likely a mistake on my part. I haven't yet managed to test this on an M1 mac, so wouldn't have seen this typo. I'll update with both to be sure. Thanks for the heads up!

[jmyersmsft]

@gauravsaralMs / @roshan-sy looks like one of you has to approve before this can merge. I approve on behalf of the Azure Artifacts Packaging team.

[zowers]

have the same error on Windows ARM64 VM