Failed to "Developing a new Runtime with the ActionLoop proxy"

I follow the document [actions-actionloop](https://github.com/apache/openwhisk/blob/master/docs/actions-actionloop.md), trying to develop a new Runtime. However, there was something wrong when I tried to debug.
At the **Debugging** stage, we enter the docker conatiner by typing "make debug". But the next step, "/bin/proxy -debug" went wrong which shows that /bin/proxy not found.
```shell
/proxy # /bin/proxy -debug
/bin/sh : /bin/proxy: not found
```
Since that the /bin/proxy was add from the openwhisk/actionloop-v2:latest, I clean the cache, and run "docker run -it openwhisk/actionloop-v2:latest", trying to see what the /bin/proxy is and whether is runnable, however I got blocked and cant enter the container.
Anyone has encountered the same problem with me and solved it? Need help! Thanks a lot.