Support added msbuild arguments in RunHelix.ps1

nit: use `[switch]` instead of `[bool]`

Author: dougbu

eng/scripts/RunHelix.ps1

@@ -19,14 +19,27 @@
     Redhat.7.Amd64.Open
 .PARAMETER RunQuarantinedTests
     By default quarantined tests are not run. Set this to $true to run only the quarantined tests.
+.PARAMETER TargetArchitecture
+    The CPU architecture to build for (x64, x86, arm). Default=x64
+.PARAMETER MSBuildArguments
+    Additional MSBuild arguments to be passed through.
 #>
+[CmdletBinding(PositionalBinding = $false)]
 param(
     [Parameter(Mandatory=$true)]
     [string]$Project,
+
     [string]$HelixQueues = "Windows.10.Amd64.Open",
+    [switch]$RunQuarantinedTests,
+
+    [ValidateSet('x64', 'x86', 'arm', 'arm64')]
     [string]$TargetArchitecture = "x64",
-    [bool]$RunQuarantinedTests = $false
+
+    # Capture the rest
+    [Parameter(ValueFromRemainingArguments = $true)]
+    [string[]]$MSBuildArguments
 )
+
 $ErrorActionPreference = 'Stop'
 $ProgressPreference = 'SilentlyContinue' # Workaround PowerShell/PowerShell#2138
 
@@ -43,4 +56,5 @@ Write-Host -ForegroundColor Yellow "And if packing for a different platform, add
 $HelixQueues = $HelixQueues -replace ";", "%3B"
 dotnet msbuild $Project /t:Helix /p:TargetArchitecture="$TargetArchitecture" /p:IsRequiredCheck=true `
     /p:IsHelixDaily=true /p:HelixTargetQueues=$HelixQueues /p:RunQuarantinedTests=$RunQuarantinedTests `
-    /p:_UseHelixOpenQueues=true /p:CrossgenOutput=false /p:ASPNETCORE_TEST_LOG_DIR=artifacts/log
+    /p:_UseHelixOpenQueues=true /p:CrossgenOutput=false /p:ASPNETCORE_TEST_LOG_DIR=artifacts/log `
+    @MSBuildArguments