How to install Proxy Cache Plugin

Hi,

I am trying to implement proxy-cache in KONG. I think it is not readily available.
We have to download and install that plugin.
I have downloaded from the bellow site.
GitHub - Kong/kong-plugin-proxy-cache: HTTP Proxy Caching for Kong.
but when I try to install it is showing error.

“Installing https://luarocks.org/kong-proxy-cache-plugin-1.3.1-0.rockspec
Cloning into ‘kong-plugin-proxy-cache’…
fatal: unable to connect to github.com:
github.com[0: 13.234.176.102]: errno=Connection timed out”

Env Details:
OS : Ubuntu
Loc : /usr/local/share/lua/5.1/kong/plugins/kong-proxy-cache-plugin
Command : sudo luarocks install kong-proxy-cache-plugin

My Doubts: Is the plugin readily available or need to install.
My plugin installaion stepis correct or Am I missing something.
Please guide me.