fix(azure-deploy): add missing check out step (#5850)

Author: cdransf

.github/workflows/preview-docs.yml

@@ -117,6 +117,11 @@ jobs:
         runs-on: ubuntu-latest
         name: Clean up PR deployment
         steps:
+            - name: Check out code
+              uses: actions/checkout@v5
+              with:
+                  fetch-depth: 0
+
             - name: Generate PR hash
               id: pr_hash
               run: |