Merge pull request #5208 from livarcocc/fix_build_script

Removing -- separator from dotnet publish task. Fixes CI.

build_projects/dotnet-cli-build/DotNetPublish.cs

@@ -77,7 +77,7 @@ namespace Microsoft.DotNet.Cli.Build
         {
             if (!string.IsNullOrEmpty(MSBuildArgs))
             {
-                return $"-- {MSBuildArgs}";
+                return $"{MSBuildArgs}";
             }
 
             return null;