Configure Ruff to format Python code on-save

Author: bangseongbeom

.vscode/settings.json

@@ -1,8 +1,12 @@
 {
-   "python.defaultInterpreterPath": "${workspaceFolder}/.venv",
+    "python.defaultInterpreterPath": "${workspaceFolder}/.venv",
     "python.testing.pytestArgs": [
         "tests"
     ],
     "python.testing.unittestEnabled": false,
-    "python.testing.pytestEnabled": true
+    "python.testing.pytestEnabled": true,
+    "[python]": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "charliermarsh.ruff"
+    }
 }