message: mac ci: clean up branch/repo before build
diff: @@ -15,6 +15,8 @@ dependencies:
  - brew ls --versions bazel >/dev/null || brew install bazel
  - |
  if [ "${PULL_REQUEST}" = "true" -a -n "${PULL_REQUEST_REPO}" -a -n "${PULL_REQUEST_SHA}" ]; then
  + git branch -D ci-branch || true
  + git remote remove pr_repo || true
  git remote add pr_repo "https://github.com/${PULL_REQUEST_REPO}.git"
  git fetch pr_repo
  git checkout -b ci-branch
  