Fixes NET 10 tests and other quirks

* Install .NET 10 SDK in Windows setup action
* Ensure dotnet 10 installs match job architecture
* Force Mono symlinks on macOS CI
* Fix macOS dotnet resolution and clean setup
* Set DOTNET_ROOT for x86 Windows runs

Author: pardeike

.github/actions/test-execute-test/action.yml

@@ -110,10 +110,28 @@ runs:
         max_attempts: 3
         retry_on: timeout
         command: |
+          $dotnetCandidates = @()
           if ('${{inputs.os == 'macos-arm64' && inputs.architecture == 'x64' && inputs.runtime-type == 'dotnet'}}' -eq 'true') {
-            $dotnet = '/Users/runner/.dotnet/x64/dotnet'
-          } else {
-            $dotnet = '/Users/runner/.dotnet/dotnet'
+            $dotnetCandidates += '/Users/runner/.dotnet/x64/dotnet'
+          }
+
+          if ($env:DOTNET_ROOT) {
+            $dotnetCandidates += (Join-Path $env:DOTNET_ROOT 'dotnet')
+          }
+
+          $dotnetCandidates += '/Users/runner/.dotnet/dotnet'
+          $dotnetCandidates += 'dotnet'
+
+          $dotnet = $null
+          foreach ($candidate in $dotnetCandidates) {
+            if ($candidate -eq 'dotnet' -or (Test-Path $candidate)) {
+              $dotnet = $candidate
+              break
+            }
+          }
+
+          if (-not $dotnet) {
+            throw 'Unable to locate a dotnet executable.'
           }
           foreach ($target_framework in ConvertFrom-Json "${{steps.test-args.outputs.target_frameworks}}") {
             $trxFileName = "${{inputs.os}}-${{inputs.architecture}}-${{inputs.runtime-type}}-${{inputs.build_configuration}}-$target_framework.trx"

.github/actions/test-setup-dotnet-windows/action.yml

@@ -15,6 +15,11 @@ inputs:
 runs:
   using: "composite"
   steps:
+    - name: Setup .NET SDK ${{inputs.architecture}}
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '10.0.x'
+
     - name: Get .NET Channel for ${{inputs.target_framework}}
       uses: ./.github/actions/get-dotnet-channel
       id: get_channel
@@ -33,16 +38,21 @@ runs:
         Invoke-WebRequest 'https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.ps1' -OutFile dotnet-install.ps1;
         .\dotnet-install.ps1 -Runtime dotnet -SkipNonVersionedFiles -NoPath -Channel LTS -Architecture ${{inputs.architecture}} -InstallDir "${{steps.get-program-files.outputs.path}}/dotnet";
         .\dotnet-install.ps1 -Runtime dotnet -SkipNonVersionedFiles -NoPath -Channel STS -Architecture ${{inputs.architecture}} -InstallDir "${{steps.get-program-files.outputs.path}}/dotnet";
-        
+
         $channel = "${{steps.get_channel.outputs.channel}}";
         if ($channel -ne '') {
           .\dotnet-install.ps1 -Runtime dotnet -SkipNonVersionedFiles -NoPath -Channel $channel -Architecture ${{inputs.architecture}} -InstallDir "${{steps.get-program-files.outputs.path}}/dotnet";
         }
-        
+
         $channels = "${{steps.get_channel.outputs.channels_multiline}}";
         if ($channels -ne '') {
           foreach ($channel in ($channels -split "[\r\n]+")) {
             .\dotnet-install.ps1 -Runtime dotnet -SkipNonVersionedFiles -NoPath -Channel $channel -Architecture ${{inputs.architecture}} -InstallDir "${{steps.get-program-files.outputs.path}}/dotnet";
           }
         }
+
+        $installRoot = (Resolve-Path (Join-Path "${{steps.get-program-files.outputs.path}}" 'dotnet')).Path;
+        if ('${{ inputs.architecture == 'x86'}}' -eq 'true') {
+          Add-Content -Path $env:GITHUB_ENV -Value "DOTNET_ROOT(x86)=$installRoot";
+        }
       shell: pwsh

.github/workflows/test-unix-mono.yml

@@ -72,10 +72,19 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y mono-complete
 
+      - name: Install Mono on macOS
+        if: runner.os == 'macOS'
+        run: |
+          brew update
+          brew install mono || (brew link --overwrite --force mono && brew install mono)
+          brew link --overwrite --force mono
+        shell: bash
+
       - name: Setup .NET SDK
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: '10.0.x'
+          architecture: ${{inputs.architecture}}
         env:
           DOTNET_INSTALL_DIR: ${{ runner.temp }}/.dotnet