read db routing when readOnly=true with secrets manager

 if you use multi(write, read) db endpoint and use @transaction(readOnly=true) then it works

-   datasource:

        url: mysql://{write db url}:3306,{read db url}:3306/db_name?useSSL=false

- @Transactional(readOnly = true)

- build.gradle

    implemxentation 'mysql:mysql-connector-java'

if you use secrects manager then you should apply driver info

- datasource:

    url: jdbc-secretsmanager:mysql:aurora://{write db url}:3306,{read db url}:3306/db_name?useSSL=false

    driver-class-name: com.amazonaws.secretsmanager.sql.AWSSecretsManagerMariaDBDriver

- build.gradle

    implementation 'mysql:mysql-connector-java'

    implementation 'com.amazonaws.secretsmanager:aws-secretsmanager-jdbc:1.0.6'

    implementation 'org.mariadb.jdbc:mariadb-java-client' 

AWS Secrets Manager JDBC is a wrapper, so you need to add a driver dependency that fits the DB separately.