makes sure gpt data files are generated only for PRs to master

Author: gcharang

.github/workflows/get_data_lint_files_deploy.yml

@@ -63,6 +63,7 @@ jobs:
         run: node utils/js/h1_presence_checker.js
 
       - name: Prepare data files for GPTs
+        if: github.base_ref == 'main' || github.ref == 'refs/heads/main'
         run: node utils/js/create_data_for_gpts.js
 
       - name: Ensure change logs are updated