fix issue 30369 enable docker build platform switch

[JL03-Yue]

Issue #30369:
translate RID in -r /amd64 to /x64
translate arch in -a amd64 to x64

[dsplaisted]

@JL03-Yue Reading through #30369, it looks like the -a and --arch parameters are missing from dotnet restore. Can you look at adding those together with this PR?

@richlander As implemented here, this will also translate the architecture from amd64 to x64 for Windows or other RIDs. It's a lot easier to implement that way. Does that sound OK?

[richlander]

Right. That sounds good.

This PR has a dependency on this change and includes some test cases.

• Update samples for platform targeting dotnet-docker#4441

If you give me an SDK build (preferably for Linux), I can try it.

[baronfel]

Nice, very happy to have this in!

[richlander]

What is the easiest way for me to get a build to test this?

So nice to see this!!!

[baronfel]

@richlander least-effort is probably going to be to wait a couple days for the codeflow to dotnet/installer, then grab an 8.0 preview installer from there. Fastest turnaround would be stitching your own SDK together by:

• building this repo locally with ./build.[cmd|sh]
• take the .\artifacts\bin\redist\Debug\dotnet\sdk\8.0.100-dev\dotnet.dll that results and copy it over dotnet.dll from a different, already-installed 8.0 nightly preview SDK
• ???
• profit

[richlander]

I love least effort. I will just try once a day starting Monday and we will see when the change shows up.

Once I have validated it work, let's start talking about the 7.0 back port.