Add missing changes to fix build break

Author: zhicwu

src/test/java/ru/yandex/clickhouse/ClickHouseContainerForTest.java

@@ -17,13 +17,15 @@ public class ClickHouseContainerForTest {
     private static final int NATIVE_PORT = 9000;
     private static final int MYSQL_PORT = 3306;
 
+    private static final String clickhouseVersion;
     private static final GenericContainer<?> clickhouseContainer;
 
     static {
         String imageTag = System.getProperty("clickhouseVersion");
         if (imageTag == null || (imageTag = imageTag.trim()).isEmpty()) {
-            imageTag = "";
+            clickhouseVersion = imageTag = "";
         } else {
+            clickhouseVersion = imageTag;
             imageTag = ":" + imageTag;
         }
 
@@ -33,6 +35,10 @@ public class ClickHouseContainerForTest {
                 .withExposedPorts(HTTP_PORT, NATIVE_PORT, MYSQL_PORT);
     }
 
+    public static String getClickHouseVersion() {
+        return clickhouseVersion;
+    }
+
     public static GenericContainer<?> getClickHouseContainer() {
         return clickhouseContainer;
     }