Fix preview package versions

Add missing suffix to the prerelease label for previews.

Author: martincostello

Directory.Build.props

@@ -52,7 +52,7 @@
     <WarnOnPackingNonPackableProject>false</WarnOnPackingNonPackableProject>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(GITHUB_ACTIONS)' != '' ">
-    <VersionSuffix Condition=" '$(VersionSuffix)' == '' AND '$(GITHUB_HEAD_REF)' == '' ">preview</VersionSuffix>
+    <VersionSuffix Condition=" '$(VersionSuffix)' == '' AND '$(GITHUB_HEAD_REF)' == '' ">preview.$(GITHUB_RUN_NUMBER)</VersionSuffix>
     <VersionSuffix Condition=" '$(VersionSuffix)' == '' AND '$(GITHUB_HEAD_REF)' != '' ">pr.$(GITHUB_REF_NAME.Replace('/merge', '')).$(GITHUB_RUN_NUMBER)</VersionSuffix>
     <VersionSuffix Condition=" '$(GITHUB_EVENT_NAME)' == 'workflow_dispatch' AND '$(GITHUB_REF_PROTECTED)' == 'true' "></VersionSuffix>
     <FileVersion Condition=" '$(GITHUB_RUN_NUMBER)' != '' ">$(VersionPrefix).$(GITHUB_RUN_NUMBER)</FileVersion>