Add use-current-runtime test

use-current-runtime/Program.cs

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+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");

use-current-runtime/console.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <Target Name="EchoRuntimeIdentifier" AfterTargets="Restore" BeforeTargets="BeforeBuild">
+      <Exec Command="echo 'RuntimeIdentifier is $(RuntimeIdentifier)'" />
+  </Target>
+
+</Project>

use-current-runtime/test.json

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+{
+  "name": "use-current-runtime",
+  "enabled": true,
+  "requiresSdk": true,
+  "version": "6.0",
+  "versionSpecific": false,
+  "type": "bash",
+  "cleanup": true,
+  "ignoredRIDs":[
+  ]
+}

use-current-runtime/test.sh

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+#!/usr/bin/bash
+
+set -euo pipefail
+
+set -x
+
+PORTABLE_RID="$(../runtime-id --portable)"
+
+DOTNET_BUILD_OUTPUT=$(dotnet build --use-current-runtime)
+
+if echo "$DOTNET_BUILD_OUTPUT" | grep -q "RuntimeIdentifier is $PORTABLE_RID"; then
+    echo "PASS: --use-current-runtime uses portable rid."
+else
+    echo "FAIL: --use-current-runtime does not use portable rid."
+    exit 1
+fi