add cache yarn option #3

	name: Codebase lint
	on: [push, pull_request]

	jobs:
	lint-client:
	name: Lint Client
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	submodules: recursive

	- uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: yarn

	- name: Install dependencies
	run: yarn install --no-lockfile --prefer-offline

	- name: Format check via Prettier
	run: yarn prettier --check .

	- name: Format check via ESLint
	run: yarn eslint -c eslintrc.format.cjs .

	- name: Code quality check via ESLint
	run: yarn eslint .

	# Python stuff
	lint-server:
	name: Server lint via Python
	runs-on: ubuntu-latest
	defaults:
	run:
	working-directory: ./server
	steps:
	- uses: actions/checkout@v4
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.10"
	cache: "pip"

	- name: Install dependencies
	run: pip install -r requirements.txt

	- name: pep8 linting
	run: pep8 .

	type-check-server:
	name: Type check with mypy
	runs-on: ubuntu-latest
	needs: [lint-server]
	defaults:
	run:
	working-directory: ./server
	steps:
	- uses: actions/checkout@v4
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.10"
	cache: "pip"

	- name: Install dependencies
	run: pip install -r requirements.txt

	- name: pep8 linting
	run: mypy

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