Host should inform user about other installed archs on the system

[vitek-karas]

Commands like dotnet --info or dotnet --list-runtimes/dotnet --list-sdks currently report only the runtimes/SDKs installed for the architecture used to run the command. But some systems can run more than one architecture, for example x86 and x64 on Windows (or x64 and arm64 on Apple M1).

For example if I install:

• .NET 5 x64
• .NET 3.1 x86 (either on purpose or accidently picked the wrong architecture)

Running dotnet --info will only list .NET 5 - which is confusing.

Consider adding the ability to "know about" all the other architectures on the system and either informing the user about their existence or maybe listing the runtimes in those locations in a separate section of the output.

Tagging subscribers to this area: @vitek-karas, @agocke, @VSadov
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Issue Details

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Commands like dotnet --info or dotnet --list-runtimes currently report only the runtimes/SDKs installed for the architecture used to run the command. But some systems can run more than one architecture, for example x86 and x64 on Windows (or x64 and arm64 on Apple M1).

For example if I install:

• .NET 5 x64
• .NET 3.1 x86 (either on purpose or accidently picked the wrong architecture)

Running dotnet --info will only list .NET 5 - which is confusing.

Consider adding the ability to "know about" all the other architectures on the system and either informing the user about their existence or maybe listing the runtimes in those locations in a separate section of the output.

Author:	vitek-karas
Assignees:	-
Labels:	area-Host
Milestone:	-

[vitek-karas]

/cc @richlander