Fix debug symbol upload path

Author: syntaxerror247

.github/workflows/build.yml

@@ -187,6 +187,6 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: native_debug_symbols.zip
-          path: ~/.local/share/godot/export_templates/${GODOT_VERSION}.${GODOT_RELEASE}/native_debug_symbols.zip
+          path: ~/.local/share/godot/export_templates/${{ env.GODOT_VERSION }}.${{ env.GODOT_RELEASE }}/native_debug_symbols.zip
           if-no-files-found: ignore
           retention-days: 28