[fix-10938]: use dot to replace source and make the default env work in shell (#11625)

* [fix-10938]: use the dot to replace source and make the default env work in the sh
Co-authored-by: Kerwin <37063904+zhuangchong@users.noreply.github.com>

dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/ShellCommandExecutor.java

@@ -101,7 +101,7 @@ public class ShellCommandExecutor extends AbstractCommandExecutor {
                     }
                 }
             } else {
-                sb.append("#!/bin/sh\n");
+                sb.append("#!/bin/bash\n");
                 sb.append("BASEDIR=$(cd `dirname $0`; pwd)\n");
                 sb.append("cd $BASEDIR\n");
                 if (!Strings.isNullOrEmpty(taskRequest.getEnvironmentConfig())) {