update to kill builds with wrong listing

.github/workflows/main.yml

@@ -26,6 +26,11 @@ jobs:
       uses: gittools/actions/gitversion/[email protected]
       with:
         useConfigFile: true
+    - run: |
+        If (("Preview", "") -notcontains ${{ steps.gitversion.outputs.GitVersion_PreReleaseLabel }}) {
+            return 1
+        } 
+      shell: pwsh
 
   build:
     runs-on: ubuntu-latest

build.ps1

@@ -99,4 +99,10 @@ if ($versionInfo.PreReleaseTag -eq "") {
 } else {
     Write-Output "Publishing PreRelease"
     gh release create $versionText .\output\$ZipName --generate-notes --generate-notes --prerelease --discussion-category "General"
-}
+}
+
+$GitVersion_PreReleaseLabel = "Preview"
+
+If (("Preview", "") -notcontains $GitVersion_PreReleaseLabel) {
+    return 1
+}