feat: support xxl-job executor NettyHandler (#30)

Only support jdk8, in jdk11 or jdk17 env, you should use file write and use urlClassLoader to load injectorClass or else.

vul/dockerfile/xxl-job/220/admin/docker-entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+
+wait-for-it -t 0 db:3306
+if [[ $(mysql -hdb -uroot -proot -e "SHOW DATABASES LIKE 'xxl_job';") == "" ]]; then
+    mysql -hdb -uroot -proot < /usr/src/tables_xxl_job.sql
+fi
+
+exec "$@"