Have GHA build the binaries

[kquinsland]

I am trying to run this exporter on a tiny raspberry pi zero with 512meg ram and a tiny microSD card to boot.
I was not looking forward to a long wait with apt get install golang ... (~350 MB!) just to build the binary.

This GHA workflow will automatically build binaries when a new release is created. I have tested this on my own repo and I was able to pull the binary and run it.

root@raspberrypi:/opt# lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 11 (bullseye)
Release:        11
Codename:       bullseye
root@raspberrypi:/opt# uname -a
Linux raspberrypi 5.15.32+ #1538 Thu Mar 31 19:37:58 BST 2022 armv6l GNU/Linux
root@raspberrypi:/opt# wget https://github.com/kquinsland/apcupsd_exporter/releases/download/v0.3.1/apcupsd_exporter-v0.3.1-linux-arm.tar.gz  
--2022-07-01 02:55:25--  https://github.com/kquinsland/apcupsd_exporter/releases/download/v0.3.1/apcupsd_exporter-v0.3.1-linux-arm.tar.gz  
Resolving github.com (github.com)... 192.30.255.112  
<...>  
2022-07-01 02:55:27 (3.74 MB/s) - ‘apcupsd_exporter-v0.3.1-linux-arm.tar.gz’ saved [5347842/5347842]  
  
root@raspberrypi:/opt# tar -xzvf apcupsd_exporter-v0.3.1-linux-arm.tar.gz     
apcupsd_exporter  
root@raspberrypi:/opt# chmod +x apcupsd_exporter    
root@raspberrypi:/opt# ./apcupsd_exporter    
2022/07/01 02:55:56 starting apcupsd exporter on ":9162" for server tcp://:3551