Add formatting and type checks

tests/test_scripts.py

@@ -140,7 +140,10 @@ esac
     assert "KarlDNS: registering hostname" in result.stdout
     config = home_dir / ".config" / "karldns" / "updater.env"
     config_text = config.read_text(encoding="utf-8")
-    assert "KARLDNS_UPDATE_URL='https://karldns.test/api/v1/router/update/karl_update_secret_12345678901234567890'" in config_text
+    assert (
+        "KARLDNS_UPDATE_URL='https://karldns.test/api/v1/router/update/karl_update_secret_12345678901234567890'"
+        in config_text
+    )
     assert "KARLDNS_HOSTNAME='abc.karldns.test'" in config_text