Fix public builds from forks (#615)

Author: ejizba

azure-pipelines/public-build.yml

@@ -24,6 +24,10 @@ extends:
             image: 1es-windows-2022
             os: windows
 
+        settings:
+            # PR's from forks do not have sufficient permissions to set tags.
+            skipBuildTagsForGitHubPullRequests: ${{ variables['System.PullRequest.IsFork'] }}
+
         stages:
             - stage: WindowsUnitTests
               dependsOn: []