Update main_py_to_bitly.yml

Author: skysign

.github/workflows/main_py_to_bitly.yml

@@ -14,6 +14,7 @@
           run: |
             echo "zero_length_string=\"\"" >> $GITHUB_ENV
             echo "path_of_main_py=$(git diff --name-only HEAD~1 HEAD | grep '/main\.py')" >> $GITHUB_ENV
+            echo "path_of_main_py=${{ env.path_of_main_py }}\"\"" >> $GITHUB_ENV
         - name: Check main.py exists
           run: |
             if [[${{ env.zero_length_string }} == ${{ env.path_of_main_py }}]]; then