Clean build during daily build to ensure MSI package is generate correctly (#6334)

Clean build during the daily build to ensure MSI package is generated correctly
- Do another clean build directly before packaging to clean up files that test has added
# Conflicts:
#	tools/appveyor.psm1

tools/appveyor.psm1

@@ -444,8 +444,13 @@ function Invoke-AppveyorFinish
             $packageParams += @{Version=$env:APPVEYOR_BUILD_VERSION}
         }
 
+        # Build clean before backing to remove files from testing
+        Start-PSBuild -CrossGen -PSModuleRestore -Configuration 'Release' -ReleaseTag $releaseTag -Clean
+
         # Build packages
         $packages = Start-PSPackage @packageParams -SkipReleaseChecks
+        $msiObject = $packages | Where-Object { $_ -is [pscustomobject] -and $_.msi }
+        $msi = $msiObject | Where-Object { $_.msi.EndsWith(".msi") } | Select-Object -ExpandProperty msi
 
         $name = Get-PackageName
 
@@ -457,7 +462,15 @@ function Invoke-AppveyorFinish
 
         $artifacts = New-Object System.Collections.ArrayList
         foreach ($package in $packages) {
-            $null = $artifacts.Add($package)
+            if($package -is [string])
+            {
+                $null = $artifacts.Add($package)
+            }
+            elseif($package -is [pscustomobject] -and $package.msi)
+            {
+                $null = $artifacts.Add($package.msi)
+                $null = $artifacts.Add($package.wixpdb)
+            }
         }
 
         $null = $artifacts.Add($zipFilePath)

tools/packaging/packaging.psm1

@@ -1656,6 +1656,18 @@ function Test-FileWxs
 
     if(!$passed)
     {
+        if($env:appveyor)
+        {
+            try
+            {
+                Push-AppveyorArtifact $HeatFilesWxsPath
+            }
+            catch
+            {
+                #ignore any error pushing the artifact
+            }
+        }
+
         throw "Current files to not match  {$FilesWxsPath}"
     }
 }