perf: Optimize `contains_call()` by adding memoization #179

	# ATTENTION
	#
	# This is not a typical luacheck workflow! Do not copy this to other projects!
	# Instead of installing luacheck from somewhere and using it on a code base,
	# we're actually building and running the current HEAD version on ourselves:
	# basically this is a combination bootstrap test and dogfooding. The upshot is
	# that we check both that everything works (and end-to-end test) and that the
	# current codebase lints against itself. This ensures we can fix a bug or make
	# a breaking change in luacheck without being blocked by our own CI using a
	# different luacheck verision.
	#
	# See the README.md file for examples suitable for use in other projects.

	name: Luacheck

	on: [ push, pull_request ]

	jobs:

	luacheck:
	strategy:
	fail-fast: false
	matrix:
	luaVersion: [ "5.4", "5.3", "5.2", "5.1", "luajit" ] # , "luajit-openresty"
	runs-on: ubuntu-22.04
	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Setup ‘lua’
	uses: leafo/gh-actions-lua@v9
	with:
	luaVersion: ${{ matrix.luaVersion }}

	- name: Setup ‘luarocks’
	uses: leafo/gh-actions-luarocks@v4

	- name: Setup dependencies
	run: \|
	luarocks install --deps-only luacheck-dev-1.rockspec

	- name: Build ‘luacheck’ (bootstrap)
	run: luarocks make

	- name: Run ‘luacheck’ (dogfood)
	run: luacheck .

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