drone/.drone/scripts/login.sh

n=0
while :
do
   docker login $1 --username client --password $2 \
    && break  # substitute your command here
   n=$((n+1))

   if [ $n -ge 10 ]; then
      echo "login failed"
      exit 1
   fi
   echo "retrying login..$n"
   sleep 5
done