[CI][UT] Fix flaky unit test (#16151)

dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-jdbc/src/test/java/org/apache/dolphinscheduler/plugin/registry/jdbc/MysqlJdbcRegistryTestCase.java

@@ -22,6 +22,7 @@ import org.apache.commons.lang3.RandomUtils;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.Statement;
+import java.time.Duration;
 import java.util.stream.Stream;
 
 import lombok.SneakyThrows;
@@ -52,7 +53,7 @@ class MysqlJdbcRegistryTestCase extends JdbcRegistryTestCase {
                 .withDatabaseName("dolphinscheduler")
                 .withNetwork(Network.newNetwork())
                 .withExposedPorts(3306)
-                .waitingFor(Wait.forHealthcheck());
+                .waitingFor(Wait.forHealthcheck().withStartupTimeout(Duration.ofSeconds(300)));
 
         int exposedPort = RandomUtils.nextInt(10000, 65535);
         mysqlContainer.setPortBindings(Lists.newArrayList(exposedPort + ":3306"));