lint: Don't fix Python formattings using ruff

As reported by Joe: https://materializeinc.slack.com/archives/C01LKF361MZ/p1703167926627519

bin/pyfmt

@@ -18,6 +18,23 @@ cd "$(dirname "$0")/.."
 . misc/shlib/shlib.bash
 
 try bin/pyactivate -m black . "$@"
-try bin/pyactivate -m ruff --fix --extend-exclude=misc/dbt-materialize .
-try bin/pyactivate -m ruff --target-version=py38 --fix misc/dbt-materialize
+
+args=("--fix")
+
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    --check)
+      # ruff only supports --fix, not --check
+      args=()
+      shift
+      ;;
+    *)
+      # Ignore all unknown arguments
+      shift
+      ;;
+  esac
+done
+
+try bin/pyactivate -m ruff "${args[@]}" --extend-exclude=misc/dbt-materialize .
+try bin/pyactivate -m ruff --target-version=py38 "${args[@]}" misc/dbt-materialize
 try_status_report