[Helper] Use random password for mailcow-reset-admin.sh (#4162)

* use random password for mailcow-reset-admin.sh

* added curly braces and removed newline from hashed password string

helper-scripts/mailcow-reset-admin.sh

@@ -19,15 +19,17 @@ read -r -p "Are you sure you want to reset the mailcow administrator account? [y
 response=${response,,}    # tolower
 if [[ "$response" =~ ^(yes|y)$ ]]; then
 	echo -e "\nWorking, please wait..."
+  random=$(</dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16})
+  password=$(docker exec -it $(docker ps -qf name=dovecot-mailcow) doveadm pw -s SSHA256 -p ${random} | tr -d '\r')
 	docker exec -it $(docker ps -qf name=mysql-mailcow) mysql -u${DBUSER} -p${DBPASS} ${DBNAME} -e "DELETE FROM admin WHERE username='admin';"
   docker exec -it $(docker ps -qf name=mysql-mailcow) mysql -u${DBUSER} -p${DBPASS} ${DBNAME} -e "DELETE FROM domain_admins WHERE username='admin';"
-	docker exec -it $(docker ps -qf name=mysql-mailcow) mysql -u${DBUSER} -p${DBPASS} ${DBNAME} -e "INSERT INTO admin (username, password, superadmin, active) VALUES ('admin', '{SSHA256}K8eVJ6YsZbQCfuJvSUbaQRLr0HPLz5rC9IAp0PAFl0tmNDBkMDc0NDAyOTAxN2Rk', 1, 1);"
+	docker exec -it $(docker ps -qf name=mysql-mailcow) mysql -u${DBUSER} -p${DBPASS} ${DBNAME} -e "INSERT INTO admin (username, password, superadmin, active) VALUES ('admin', '${password}', 1, 1);"
 	docker exec -it $(docker ps -qf name=mysql-mailcow) mysql -u${DBUSER} -p${DBPASS} ${DBNAME} -e "DELETE FROM tfa WHERE username='admin';"
 	echo "
 Reset credentials:
 ---
 Username: admin
-Password: moohoo
+Password: ${random}
 TFA: none
 "
 else