You can find this from hub.docker.com.
You can running a Jnlp-Agent use below cmd line:
docker run --rm surenpi/hugo-jnlp-agent hugo help
You can add this agent to your kubernetes plugin, like:
Name=jnlp
Docker image=surenpi/hugo-jnlp-agent
Command to run=
Arguments to pass to the command=${computer.jnlpmac} ${computer.name}
Allocate pseudo-TTY=false