restore the NoPackage switch for VSO signing build

scripts/ci_build.cmd

@@ -4,9 +4,27 @@ REM Copyright (c) .NET Foundation and contributors. All rights reserved.
 REM Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 set CI_BUILD=1
-set CONFIGURATION=%1
 set VERBOSE=1
 
-CALL %~dp0..\build.cmd %2
+REM Shift breaks %~dp0 so capture it first
+set MY_DIR=%~dp0
+
+REM Parse arguments
+:loop
+IF NOT "%1"=="" (
+    IF "%1"=="-NoPackage" (
+        SET DOTNET_BUILD_SKIP_PACKAGING=1
+    ) ELSE IF "%CONFIGURATION%"=="" (
+        SET CONFIGURATION=%1
+    ) ELSE IF "%TARGETS%"=="" (
+        SET TARGETS=%1
+    ) ELSE (
+        SET TARGETS=%TARGETS% %1
+    )
+    SHIFT
+    GOTO :loop
+)
+
+CALL %MY_DIR%..\build.cmd %TARGETS%
 
 exit /b %errorlevel%

scripts/dotnet-cli-build/PublishTargets.cs

@@ -14,6 +14,12 @@ public static class PublishTargets
         [Target(nameof(PrepareTargets.Init))]
         public static BuildTargetResult Publish(BuildTargetContext c)
         {
+            if (string.Equals(Environment.GetEnvironmentVariable("DOTNET_BUILD_SKIP_PACKAGING"), "1", StringComparison.Ordinal))
+            {
+                c.Info("Skipping packaging because DOTNET_BUILD_SKIP_PACKAGING is set");
+                return c.Success();
+            }
+
             // NOTE(anurse): Currently, this just invokes the remaining build scripts as-is. We should port those to C# as well, but
             // I want to get the merged in.