util: change default image flow-ubuntu22-builder --> orfs

Signed-off-by: Vitor Bandeira <[email protected]>

Author: vvbandeira

flow/util/docker_shell

@@ -62,7 +62,7 @@ docker run $user_args \
  -v $WORKSPACE:/OpenROAD-flow-scripts/flow:Z \
  --network host \
  $DOCKER_INTERACTIVE \
- ${OR_IMAGE:-openroad/flow-ubuntu22.04-builder:latest} \
+ ${OR_IMAGE:-openroad/orfs:latest} \
  bash -c "set -ex
  mkdir /tmp/xdg-run
  cd /OpenROAD-flow-scripts/flow