Update MSTest template.json to create dotnet.config

[Youssef1313]

Fixes #50054

[bradwilson]

@Youssef1313 I assume "actionId": "597E7933-0D87-452C-B094-8FA0EEF7FD97", is only available when using .NET 10 SDK. Can this be used from templates that might be used with older versions of .NET SDK, without generating errors? Or, better yet, is it possible for a project template to know what version of .NET SDK it's being invoked with to make this step conditional based on being run with .NET 10 SDK?

[bradwilson]

Also, was this project template action already shipped in .NET 10 SDK Preview 7, or will it be forthcoming in a future .NET 10 SDK Preview?

[bradwilson]

Just verified that this is not in preview 7:

The post action 597e7933-0d87-452c-b094-8fa0eef7fd97 is not supported.
Description: Create or update 'dotnet.config' file required by Microsoft.Testing.Platform.
Manual instructions: Manually create 'dotnet.config' file setting the test runner to Microsoft.Testing.Platform

[Youssef1313]

Yup, not available in preview 7 and won't be available in RC1 unfortunately. It will be in RC2 only 😢

Can this be used from templates that might be used with older versions of .NET SDK, without generating errors?

The only thing I can think of is "continue on error". So the message saying that the post action is not supported will be printed, followed by the description and manual instructions that are present in templates.

[bradwilson]

At the moment, I'm gating it on the user choosing net10.0 for their framework. It's not perfect, but it's as good as I can get without knowing what version of the SDK the user is currently using.