Add nuget.config to root when building on onebranch (#183)

Signed-off-by: Alan Jowett <[email protected]>

scripts/onebranch/Nuget.config

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (c) Microsoft Corporation
+  SPDX-License-Identifier: MIT
+-->
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="undock_PublicPackages" value="https://pkgs.dev.azure.com/microsoft/undock/_packaging/Undock_PublicPackages/nuget/v3/index.json" />
+  </packageSources>
+</configuration>

scripts/onebranch/pre-build.ps1

@@ -7,6 +7,12 @@ $scriptPath = Split-Path -Parent $MyInvocation.MyCommand.Definition
 # Change the parent directory for the script directory
 Set-Location $scriptPath\..\..
 
-.\scripts\initialize_repo.ps1
+try {
+    Copy-Item .\scripts\onebranch\nuget.config .\nuget.config
+    .\scripts\initialize_repo.ps1
+}
+catch {
+    throw "Failed to initialize the repository."
+}
 
 Get-ChildItem -Path ./external -Filter *.dll -Recurse | Remove-Item