script create_db.sh takes wrong docker image

I run into a failure with script create_db.sh. This uses the command set $( docker ps|grep ${MYSQL_DOCKER_NAME}|awk '{ print $1 }' ) to get the mysql / mariadb docker image.

The problem was that I had already a docker instance with mysql in it name, so the commands got two images.

I fixed it locally for me by using MYSQL_DOCKER_NAME=${1:-mariadb} instead of MYSQL_DOCKER_NAME=${1:-mariadb}. But guess I would have more than one mariadb instance on my server...

I hope someone can fix it to make it more secure..