Add threadsafety documentation #17

	name: downstream
	concurrency:
	group: "${{github.workflow}}-${{github.ref}}"
	cancel-in-progress: true
	on:
	workflow_dispatch:
	schedule:
	- cron: "0 8 * * 3" # At 08:00 on Wednesday # https://crontab.guru/#0_8___3
	push:
	branches:
	- main
	- "*-stable"
	tags:
	- v..*
	pull_request:
	types: [opened, synchronize]
	branches:
	- '*'

	jobs:
	activerecord:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: ruby/setup-ruby-pkgs@v1
	with:
	ruby-version: "3.3"
	bundler: latest
	bundler-cache: true
	apt-get: sqlite3 # active record test suite uses the sqlite3 cli
	- uses: actions/cache@v4
	with:
	path: ports
	key: ports-ubuntu-${{ hashFiles('ext/sqlite3/extconf.rb','dependencies.yml') }}
	- run: bundle exec rake compile
	- name: checkout rails and configure
	run: \|
	git clone --depth 1 --branch main https://github.com/rails/rails
	cd rails
	bundle install
	bundle remove sqlite3
	bundle add sqlite3 --path=".."
	sed -i 's/^gem "sqlite3".*//' activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
	- name: run tests
	run: \|
	cd rails/activerecord
	bundle show --paths sqlite3
	bundle exec rake test:sqlite3

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