Add Zabbix DB init script

init_zabbix_db.sh

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+mysql -e "CREATE DATABASE IF NOT EXISTS zabbix character set utf8mb4 collate utf8mb4_bin; CREATE USER IF NOT EXISTS 'zabbix'@'%' IDENTIFIED BY 'zabbix_pwd'; GRANT ALL PRIVILEGES ON zabbix.* TO 'zabbix'@'%'; SET GLOBAL log_bin_trust_function_creators = 1; FLUSH PRIVILEGES;"