message: ci: another api_mirror.sh fixup.
diff: @@ -30,7 +30,7 @@ then
  # For each SHA, hard reset, rsync api/ and generate commit in
  # envoyproxy/data-plane-api
  API_WORKING_DIR="$TMPDIR/envoy-api-mirror"
  - git worktree add "$API_WORKING_DIR" master
  + git worktree add "$API_WORKING_DIR"
  for sha in $SHAS
  do
  git -C "$API_WORKING_DIR" reset --hard "$sha"
  