[ci] fix test result upload on release branch (ray-project#43859)

should not upload test results on the release branch. missed a return statement here.

Signed-off-by: can <[email protected]>

ci/ray_ci/tester_container.py

@@ -110,6 +110,7 @@ def run_tests(
  def _persist_test_results(self, team: str, bazel_log_dir: str) -> None:
  if os.environ.get("BUILDKITE_BRANCH") != "master":
  logger.info("Skip upload test results. We only upload on master branch.")
+ return
  if os.environ.get("BUILDKITE_PIPELINE_ID") != PIPELINE_POSTMERGE:
  logger.info(
  "Skip upload test results. We only upload on postmerge pipeline."