refactor: define FILENAME as env

Author: paulz

.github/workflows/cat-test-examples.yml

@@ -71,11 +71,11 @@ jobs:
       - name: Upload main artifacts to Google Drive
         if: always() && github.ref == 'refs/heads/main'
         run: |
-          FILENAME=test-output-${{ github.run_number }}.zip
           zip -r "$FILENAME" examples/team_recommender/tests/test_runs
           uv run python src/cat_ai/publish_to_gdrive.py "$FILENAME"
         env:
           PARENT_FOLDER_IDS: ${{ vars.GOOGLE_DRIVE_TEST_OUTPUT_FOLDER_ID }}
+          FILENAME: test-output-${{ github.run_number }}.zip
 
       - name: Upload artifacts
         uses: actions/upload-artifact@v4