ADD: Db2 container support

ebean-test/src/test/java/main/StartDb2.java

@@ -0,0 +1,22 @@
+package main;
+
+import io.ebean.docker.commands.Db2Config;
+import io.ebean.docker.commands.Db2Container;
+
+public class StartDb2 {
+
+  public static void main(String[] args) {
+
+    Db2Config config = new Db2Config("11.5.6.0a");
+    config.setDbName("unit");
+    config.setUser("unit");
+    config.setPassword("unit");
+
+    // to change collation, charset and other parameters like pagesize:
+    config.setCreateOptions("USING CODESET UTF-8 TERRITORY DE COLLATE USING IDENTITY PAGESIZE 32768");
+    config.setConfigOptions("USING STRING_UNITS CODEUNITS32");
+
+    Db2Container container = new Db2Container(config);
+    container.startWithDropCreate();
+  }
+}