|||
  n=0
  while :
  do
    docker login $${REGISTRY_DOMAIN}:$${REGISTRY_PORT}/ --username client --password "$${REGISTRY_PASSWORD}" \\
      && break  # substitute your command here
    n=$((n+1))
        if [ $n -ge 10 ]; then
        echo "login failed"
        exit 1
    fi
    echo "retrying login..$n"
    sleep 5
  done
|||