Update preview-build.yml (#2346)

Add fetch-depth back.

Author: theletterf

.github/workflows/preview-build.yml

@@ -678,6 +678,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
       - name: Run Vale Linter
         uses: elastic/vale-rules/lint@main
         with: