CI: add lua lint check #26

	name: Tests on vim and neovim

	# Controls when the workflow will run
	on:
	# Triggers the workflow on push or pull request events but only for the master branch
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	lint:
	name: Lint code with Vint and shellcheck
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	# There exists a vint github action but it can't install the alpha
	# version. vint has not been moving since 2020 and we need to use the
	# alpha release since it fixed some things wrt the latest stable release.
	- uses: actions/setup-python@v1
	- name: Install vint
	run: pip install --pre vim-vint
	- name: Lint vimscript files
	run: vint --warning --enable-neovim ./after ./autoload ./compiler ./ftdetect ./ftplugin ./indent ./syntax
	- uses: lunarmodules/luacheck@v1
	- uses: ludeeus/action-shellcheck@master

	tests:
	runs-on: ubuntu-latest
	needs: lint
	strategy:
	fail-fast: false
	matrix:
	editor: ["vim", "nvim"]

	steps:
	- uses: actions/checkout@v2
	- name: Setup ${{ matrix.editor }}
	uses: rhysd/action-setup-vim@v1
	id: vim
	with:
	neovim: ${{ matrix.editor == 'nvim' }}
	- name: Run Vader unit tests
	run: \|
	TESTVIM=${{ matrix.editor }}
	export TESTVIM
	./test/run-tests.sh

Provide feedback