fix: Update MariaDB startup script

images/mariadb/startup.sh

 if [ ! -z $MYSQL_ROOT_PWD ]; then
     # start server
     echo "Starting server"
-    /usr/bin/mysqld_safe --datadir='/var/lib/mysql' & #--skip-grant-tables &
+    /usr/bin/mariadbd-safe --datadir='/var/lib/mysql' & #--skip-grant-tables &
     pid="$!"
     echo "Mysql pid: $pid"
 
     # set root password
     echo "Setting root password"
     #/usr/bin/mysqladmin -u root flush-privileges password "$MYSQL_ROOT_PWD"
-    echo "UPDATE mysql.user SET password=PASSWORD('$MYSQL_ROOT_PWD') WHERE user='root';" | "${mysql}"
+    echo "USE mysql;" | "${mysql}"
+    echo "ALTER USER 'root'@'localhost' IDENTIFIED VIA mysql_native_password;" | "${mysql}"
+    echo "SET PASSWORD FOR 'root'@'localhost' = PASSWORD('$MYSQL_ROOT_PWD');" | "${mysql}"
+    echo "FLUSH PRIVILEGES;" | "${mysql}"
     #echo "SET PASSWORD FOR 'root' = PASSWORD('$MYSQL_ROOT_PWD');" | "${mysql}"
     if [ $? != 0 ]; then
         echo >&2 'MySQL root password setting failed.'
 fi
 
 echo "Restarting server"
-/usr/bin/mysqld_safe --datadir='/var/lib/mysql'
+/usr/bin/mariadbd-safe --datadir='/var/lib/mysql'