[Blazor] Treat RuntimeIdentifiers as local property (#50487)

Author: maraf

src/BlazorWasmSdk/Targets/Microsoft.NET.Sdk.BlazorWebAssembly.Current.props

@@ -9,11 +9,12 @@ WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and
 Copyright (c) .NET Foundation. All rights reserved.
 ***********************************************************************************************
 -->
-<Project ToolsVersion="14.0" TreatAsLocalProperty="RuntimeIdentifier">
+<Project ToolsVersion="14.0" TreatAsLocalProperty="RuntimeIdentifier;RuntimeIdentifiers">
   <PropertyGroup>
     <OutputType>exe</OutputType>
 
     <RuntimeIdentifier>browser-wasm</RuntimeIdentifier>
+    <RuntimeIdentifiers>$(RuntimeIdentifier)</RuntimeIdentifiers>
     <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
     <CopyOutputSymbolsToPublishDirectory>false</CopyOutputSymbolsToPublishDirectory>
 

test/Microsoft.NET.Sdk.BlazorWebAssembly.Tests/WasmBuildIntegrationTest.cs

@@ -697,6 +697,23 @@ public class TestReference
             fileInWwwroot.Should().Exist();
         }
 
+        [RequiresMSBuildVersionFact("17.12", Reason = "Needs System.Text.Json 8.0.5")]
+        public void Restore_WithRuntime_Works()
+        {
+            var testInstance = CreateAspNetSdkTestAsset("BlazorHosted");
+
+            var nugetRestorePath = Path.Combine(testInstance.TestRoot, ".nuget");
+
+            new DotnetRestoreCommand(Log, "-bl:msbuild-restore.binlog", "-r", "linux-x64")
+                .WithWorkingDirectory(Path.Combine(testInstance.TestRoot, "blazorhosted"))
+                .WithEnvironmentVariable("NUGET_PACKAGES", nugetRestorePath)
+                .Execute()
+                .Should().Pass();
+
+            new DirectoryInfo(Path.Combine(nugetRestorePath, "microsoft.netcore.app.runtime.mono.linux-x64"))
+                .Should().NotExist();
+        }
+
         [RequiresMSBuildVersionFact("17.12", Reason = "Needs System.Text.Json 8.0.5")]
         public void Build_WithReference_Works()
         {