Gradle execute SQL script in Postgresql database

gistfile1.txt

import groovy.sql.Sql

task dropDatabase {
    doLast {
        Class.forName("org.postgresql.Driver")
        def sql = groovy.sql.Sql.newInstance(
                "jdbc:postgresql://localhost:5432/",
                ${DBA_USER},
                ${DBA_PASSWORD},
                "org.postgresql.Driver"
        );

        sql.execute(
                '''
                    DROP DATABASE IF EXISTS auditstore;
                    DROP OWNED BY  auditstore;
                    DROP ROLE IF EXISTS auditstore;
                '''
        )
    }
}