Make "dotnet workload restore" conditional

.github/workflows/build.yml

@@ -67,12 +67,12 @@ jobs:
 
     - name: Build, test and pack
       if: ${{ runner.os == 'Windows' }}
-      run: eng\common\CIBuild.cmd -configuration Release -prepareMachine -integrationTest /p:SuppressSymbolPackageFormatValidation=true
+      run: eng\common\CIBuild.cmd -configuration Release -prepareMachine -integrationTest /p:RestoreDotNetWorkloads=true
 
     - name: Build, test and pack
       if: ${{ runner.os != 'Windows' }}
       shell: pwsh
-      run: ./eng/common/cibuild.sh -configuration Release -prepareMachine -integrationTest /p:SuppressSymbolPackageFormatValidation=true
+      run: ./eng/common/cibuild.sh -configuration Release -prepareMachine -integrationTest /p:RestoreDotNetWorkloads=true
 
     - name: Attest artifacts
       uses: actions/attest-build-provenance@bdd51370e0416ac948727f861e03c2f05d32d78e # v1.3.2

Directory.Build.props

@@ -14,6 +14,7 @@
     <DebugSymbols>true</DebugSymbols>
     <DebugType>portable</DebugType>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    <SuppressSymbolPackageFormatValidation>true</SuppressSymbolPackageFormatValidation>
     <CodeAnalysisRuleset>$(MSBuildThisFileDirectory)eng\CodeAnalysis.ruleset</CodeAnalysisRuleset>
     <EnableXlfLocalization>false</EnableXlfLocalization>
     <ProduceReferenceAssembly>true</ProduceReferenceAssembly>

eng/Tools.props

@@ -8,7 +8,7 @@
     Restore the .NET workloads immediately after the .NET tooling has been installed by Arcade.
   -->
 
-  <Target Name="RestoreWorkloads" AfterTargets="InstallDotNetCore">
+  <Target Name="RestoreWorkloads" AfterTargets="InstallDotNetCore" Condition=" '$(RestoreDotNetWorkloads)' == 'true' ">
     <Message Text="Installing the .NET workloads required to build the solution..." />
 
     <Exec Command='"$(DotNetTool)" workload restore' WorkingDirectory="$(RepoRoot)" ConsoleToMSBuild="true">