Building logstash-forwarder v0.3.0 for armhf

(or, I really should learn more about this ‘Go’ thing)

The wonders of Logstash is a subject for a future blog post, but in the mean time the following are my notes for building logstash-forwarder to run on an armhf device (specifically, a Raspberry Pi, running Raspbian). These instructions assume a modern Linux machine (I run Ubuntu 14.04).