Fixing internal builds (#1029)

* Fixing internal builds

* nit

azure-pipelines.yml

@@ -163,6 +163,7 @@ stages:
 - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
   - template: eng\common\templates\post-build\post-build.yml
     parameters:
+      publishingInfraVersion: 3
       # Symbol validation isn't being very reliable lately. This should be enabled back
       # once this issue is resolved: https://github.com/dotnet/arcade/issues/2871
       enableSymbolValidation: false

eng/Publishing.props

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project>
+   <PropertyGroup>
+      <PublishingVersion>3</PublishingVersion>
+   </PropertyGroup>
+</Project>