Self-contained publish/build error

Describe the bug

When I try to do a self-contained build and publish of an app I wish to publish to App Service prior to RC2 being on it, I am seeing errors, and as such am blocked from being able to build a self-contained publish package.

To Reproduce

I have an example repository here: https://github.com/bradygaster/TodoApp

It contains two projects in one VS solution. It also contains a setup.ps1 file you can run to see the issue. One of the projects will build and publish just fine, the second will build but when the publish command runs this error is visible:

C:\Program Files\dotnet\sdk\6.0.100-rc.2.21501.4\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(150,5): error NETSDK1031: It is not supported to build or publish a self-contained application without specifying a RuntimeIdentifier. You must either specify a RuntimeIdentifier or set SelfContained to false. [C:\Users\brady\source\TodoApp\TodoApp.API\TodoApp.API.csproj]

Further technical details

My dotnet-version is:

❯ dotnet --version
6.0.100-rc.2.21501.4

And dotnet --info is:

.NET SDK (reflecting any global.json):
 Version:   6.0.100-rc.2.21501.4
 Commit:    18c7fa28d1

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22000
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\6.0.100-rc.2.21501.4\

Host (useful for support):
  Version: 6.0.0-rc.2.21470.23
  Commit:  826f81a11a

.NET SDKs installed:
  5.0.301 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.1.21370.1 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.1.21458.32 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.2.21467.17 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.2.21501.4 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-rc.1.21452.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-rc.2.21470.37 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.1.21375.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.1.21451.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.2.21470.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-preview.7.21369.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.1.21451.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.2.21470.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

@richlander asked me to file this when I showed him the issue, and that I cc @sfoslund in the issue. Thanks to the team for your hard work!

[richlander]

@bradygaster Is this the line that is producing the error? https://github.com/bradygaster/TodoApp/blob/0decfd788b9952633c24afc17e2f3fe978fc1ca7/setup.ps1#L23

As an aside, this command can now be simplified, from:

dotnet publish TodoApp.API\TodoApp.API.csproj --self-contained -r win-x86 -o publish\api

to

dotnet publish TodoApp.API\TodoApp.API.csproj --sc -a x86 -o publish\api

Note: this assumes the command is always run on Windows.

[bradygaster]

@bradygaster Is this the line that is producing the error? https://github.com/bradygaster/TodoApp/blob/0decfd788b9952633c24afc17e2f3fe978fc1ca7/setup.ps1#L23

No it was this one: https://github.com/bradygaster/TodoApp/blob/0decfd788b9952633c24afc17e2f3fe978fc1ca7/setup.ps1#L28