Convert a pre-v1.19.0 in-volume database marker to current usage

convert-old-db.sh

#!/bin/bash

# convert the marker on an old pre-ddev v1.19 database to current usage
# See issue at https://github.com/drud/ddev/issues/4129
# First argument should be the project name
# Second argument is the correct value you want, for example, 
# mariadb_10.2 or mysql_8.0
# Example: bash convert-old-db.sh fe-kuerschnersmart mariadb_10.2

if [ $# != 2 ]; then
  echo "Please run this with '$0 <projectname> dbtype_dbversion', for example '$0 myproject mariadb_10.3'" && exit 1
fi
set -x
project=$1
db_type=$2
docker run -it --rm -v ${project}-mariadb:/tmp/db busybox sh -c "echo $db_type > /tmp/db/db_mariadb_version.txt"
set +x
echo -n "your in-volume database type_version is now " 
docker run -it --rm -v ${project}-mariadb:/tmp/db busybox sh -c 'cat /tmp/db/db_mariadb_version.txt'