Add GHA test workflow, update setup section in docs #2

	---
	name: luarocks test

	on:
	push:
	branches:
	- main
	pull_request:
	workflow_dispatch:

	jobs:
	build:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v4
	with:
	ref: ${{ github.ref }}
	- name: Install neovim
	uses: rhysd/action-setup-vim@v1
	with:
	neovim: true
	version: nightly
	- name: Install Lua
	uses: leso-kn/gh-actions-lua@master
	with:
	luaVersion: "5.1"
	- name: Install Luarocks
	uses: hishamhm/gh-actions-luarocks@master
	with:
	luarocksVersion: "3.11.0"

	- name: Install nlua using luarocks make
	run: luarocks make --local

	- name: Run tests
	run: \|
	luarocks test --local

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