verify that HEAD exists

Author: tido64

.ado/templates/npm-publish.yml

@@ -12,6 +12,7 @@ steps:
     displayName: Verify release config
 
   - script: |
+      git show HEAD
       yarn nx release --dry-run
     displayName: Version and publish packages (dry run)
     condition: ${{ ne(variables['publish_react_native_macos'], '1') }}