Compile package apm-agent-core

[xhrg]

The overall compilation takes too much time， If I only modify the apm-agent-core code，how can I compile it。
整体编译需要花费太多时间，请问，如果我只改了 apm-agent-core，我应该如何编译。

[wu-sheng]

Usually, this is not recommended. I am not sure why you want to do this, but this is a maven thing, not SkyWalking's.