Fix the publish step for VSIX packages

src/Setup/Vsix/myget_org-extensions.config

@@ -4,6 +4,6 @@
   we run after every signed build uploads all shipped extensions in the VSIX folder to myget.org
  -->
 <extensions>
-  <extension id="Roslyn.Deployment.Full" />
-  <extension id="Roslyn.Deployment.Full.Next" />
+  <extension id="Roslyn.Deployment.Full" path="Vsix\Roslyn.Deployment.Full" />
+  <extension id="Roslyn.Deployment.Full.Next" path="Vsix\Roslyn.Deployment.Full.Next" />
 </extensions>

src/Tools/MicroBuild/publish-assets.ps1

@@ -98,6 +98,11 @@ try
     {
         $nupkg = $package.id + "." + $package.version + ".nupkg"
         Write-Host "  Uploading '$nupkg' to '$sourceUrl'"
+        if (-not (test-path $nupkg))
+        {
+            Write-Error "NuGet $nupkg does not exist"
+            $exitCode = 6
+        }
 
         if (-not $test) 
         {
@@ -124,11 +129,11 @@ try
     pushd $vsixPath
     foreach ($extension in $extensions.extensions.extension)
     {
-        $vsix = $extension.id + ".vsix"
+        $vsix = join-path $extension.path ($extension.id + ".vsix")
         if (-not (test-path $vsix)) 
         {
             Write-Error "VSIX $vsix does not exist"
-            $extiCode = 5
+            $exitCode = 6
         }
 
         $requestUrl = "https://dotnet.myget.org/F/roslyn/vsix/upload"