Attempt to fix proc-arch issues in mac.

Author: Jstatia

.github/workflows/dotnet.yml

@@ -46,6 +46,10 @@ jobs:
       with:
         dotnet-version: 8.0.x
 
+    # Show dotnet info for debugging architecture issues
+    - name: Show .NET info
+      run: dotnet --info
+
     # Use the Dotnet Test command to load dependencies, build, and test the code.
     # We have to run the test projects individually so CoseSignTool.Tests can run under arm64 on the Mac runner.
     - name: Build and Test debug

Directory.Build.props

@@ -4,5 +4,9 @@
     <EnableMSTestRunner>true</EnableMSTestRunner>
     <TestingPlatformShowTestsFailure>true</TestingPlatformShowTestsFailure>
     <TestingPlatformDotnetTestSupport>true</TestingPlatformDotnetTestSupport>
+    <!-- Configure architecture for macOS ARM64 runners -->
+    <TestingPlatformArchitecture Condition="'$(OS)' == 'Unix' AND $([MSBuild]::IsOSPlatform('OSX'))">arm64</TestingPlatformArchitecture>
+    <!-- Alternative: Use RuntimeIdentifier on macOS -->
+    <RuntimeIdentifier Condition="'$(OS)' == 'Unix' AND $([MSBuild]::IsOSPlatform('OSX')) AND '$(RuntimeIdentifier)' == ''">osx-arm64</RuntimeIdentifier>
   </PropertyGroup>
 </Project>